diff --git a/SabreTools.DatFiles/DatFile.cs b/SabreTools.DatFiles/DatFile.cs
index e474b633..f95839bc 100644
--- a/SabreTools.DatFiles/DatFile.cs
+++ b/SabreTools.DatFiles/DatFile.cs
@@ -277,7 +277,7 @@ namespace SabreTools.DatFiles
             }
 
             // Get the key and add the file
-            key = item.GetKey(Field.Machine_Name);
+            key = item.GetKey(ItemKey.Machine);
             Items.Add(key, item);
 
             return key;
diff --git a/SabreTools.DatFiles/ItemDictionary.cs b/SabreTools.DatFiles/ItemDictionary.cs
index 1c953640..c8466a1b 100644
--- a/SabreTools.DatFiles/ItemDictionary.cs
+++ b/SabreTools.DatFiles/ItemDictionary.cs
@@ -24,7 +24,7 @@ namespace SabreTools.DatFiles
         /// <summary>
         /// Determine the bucketing key for all items
         /// </summary>
-        private Field bucketedBy;
+        private ItemKey bucketedBy;
 
         /// <summary>
         /// Determine merging type for all items
@@ -616,10 +616,10 @@ namespace SabreTools.DatFiles
         }
 
         /// <summary>
-        /// Override the internal Field value
+        /// Override the internal ItemKey value
         /// </summary>
         /// <param name="newBucket"></param>
-        public void SetBucketedBy(Field newBucket)
+        public void SetBucketedBy(ItemKey newBucket)
         {
             bucketedBy = newBucket;
         }
@@ -930,7 +930,7 @@ namespace SabreTools.DatFiles
         /// </summary>
         public ItemDictionary()
         {
-            bucketedBy = Field.NULL;
+            bucketedBy = ItemKey.NULL;
             mergedBy = DedupeType.None;
             items = new ConcurrentDictionary<string, List<DatItem>>();
             logger = new Logger(this);
@@ -943,11 +943,11 @@ namespace SabreTools.DatFiles
         /// <summary>
         /// Take the arbitrarily bucketed Files Dictionary and convert to one bucketed by a user-defined method
         /// </summary>
-        /// <param name="bucketBy">Field enum representing how to bucket the individual items</param>
+        /// <param name="bucketBy">ItemKey enum representing how to bucket the individual items</param>
         /// <param name="dedupeType">Dedupe type that should be used</param>
         /// <param name="lower">True if the key should be lowercased (default), false otherwise</param>
         /// <param name="norename">True if games should only be compared on game and file name, false if system and source are counted</param>
-        public void BucketBy(Field bucketBy, DedupeType dedupeType, bool lower = true, bool norename = true)
+        public void BucketBy(ItemKey bucketBy, DedupeType dedupeType, bool lower = true, bool norename = true)
         {
             // If we have a situation where there's no dictionary or no keys at all, we skip
             if (items == null || items.Count == 0)
@@ -1013,7 +1013,7 @@ namespace SabreTools.DatFiles
                     DatItem.Sort(ref sortedlist, false);
 
                     // If we're merging the roms, do so
-                    if (dedupeType == DedupeType.Full || (dedupeType == DedupeType.Game && bucketBy == Field.Machine_Name))
+                    if (dedupeType == DedupeType.Full || (dedupeType == DedupeType.Game && bucketBy == ItemKey.Machine))
                         sortedlist = DatItem.Merge(sortedlist);
 
                     // Add the list back to the dictionary
@@ -1208,31 +1208,31 @@ namespace SabreTools.DatFiles
         /// <summary>
         /// Get the highest-order Field value that represents the statistics
         /// </summary>
-        private Field GetBestAvailable()
+        private ItemKey GetBestAvailable()
         {
             // If all items are supposed to have a SHA-512, we bucket by that
             if (DiskCount + MediaCount + RomCount - NodumpCount == SHA512Count)
-                return Field.DatItem_SHA512;
+                return ItemKey.SHA512;
 
             // If all items are supposed to have a SHA-384, we bucket by that
             else if (DiskCount + MediaCount + RomCount - NodumpCount == SHA384Count)
-                return Field.DatItem_SHA384;
+                return ItemKey.SHA384;
 
             // If all items are supposed to have a SHA-256, we bucket by that
             else if (DiskCount + MediaCount + RomCount - NodumpCount == SHA256Count)
-                return Field.DatItem_SHA256;
+                return ItemKey.SHA256;
 
             // If all items are supposed to have a SHA-1, we bucket by that
             else if (DiskCount + MediaCount + RomCount - NodumpCount == SHA1Count)
-                return Field.DatItem_SHA1;
+                return ItemKey.SHA1;
 
             // If all items are supposed to have a MD5, we bucket by that
             else if (DiskCount + MediaCount + RomCount - NodumpCount == MD5Count)
-                return Field.DatItem_MD5;
+                return ItemKey.MD5;
 
             // Otherwise, we bucket by CRC
             else
-                return Field.DatItem_CRC;
+                return ItemKey.CRC;
         }
 
         /// <summary>
diff --git a/SabreTools.DatItems/DatItem.cs b/SabreTools.DatItems/DatItem.cs
index a3f41eeb..f73aac78 100644
--- a/SabreTools.DatItems/DatItem.cs
+++ b/SabreTools.DatItems/DatItem.cs
@@ -429,12 +429,12 @@ namespace SabreTools.DatItems
         /// <summary>
         /// Get the dictionary key that should be used for a given item and bucketing type
         /// </summary>
-        /// <param name="bucketedBy">Field value representing what key to get</param>
+        /// <param name="bucketedBy">ItemKey value representing what key to get</param>
         /// <param name="lower">True if the key should be lowercased (default), false otherwise</param>
         /// <param name="norename">True if games should only be compared on game and file name, false if system and source are counted</param>
         /// <returns>String representing the key to be used for the DatItem</returns>
         /// TODO: What other fields can we reasonably allow bucketing on?
-        public virtual string GetKey(Field bucketedBy, bool lower = true, bool norename = true)
+        public virtual string GetKey(ItemKey bucketedBy, bool lower = true, bool norename = true)
         {
             // Set the output key as the default blank string
             string key = string.Empty;
@@ -442,11 +442,11 @@ namespace SabreTools.DatItems
             // Now determine what the key should be based on the bucketedBy value
             switch (bucketedBy)
             {
-                case Field.DatItem_CRC:
+                case ItemKey.CRC:
                     key = Constants.CRCZero;
                     break;
 
-                case Field.Machine_Name:
+                case ItemKey.Machine:
                     key = (norename ? string.Empty
                         : Source.Index.ToString().PadLeft(10, '0')
                             + "-")
@@ -461,27 +461,27 @@ namespace SabreTools.DatItems
 
                     break;
 
-                case Field.DatItem_MD5:
+                case ItemKey.MD5:
                     key = Constants.MD5Zero;
                     break;
 
-                case Field.DatItem_SHA1:
+                case ItemKey.SHA1:
                     key = Constants.SHA1Zero;
                     break;
 
-                case Field.DatItem_SHA256:
+                case ItemKey.SHA256:
                     key = Constants.SHA256Zero;
                     break;
 
-                case Field.DatItem_SHA384:
+                case ItemKey.SHA384:
                     key = Constants.SHA384Zero;
                     break;
 
-                case Field.DatItem_SHA512:
+                case ItemKey.SHA512:
                     key = Constants.SHA512Zero;
                     break;
 
-                case Field.DatItem_SpamSum:
+                case ItemKey.SpamSum:
                     key = Constants.SpamSumZero;
                     break;
             }
diff --git a/SabreTools.DatItems/Disk.cs b/SabreTools.DatItems/Disk.cs
index cd6a02c9..7a0c9109 100644
--- a/SabreTools.DatItems/Disk.cs
+++ b/SabreTools.DatItems/Disk.cs
@@ -366,14 +366,8 @@ namespace SabreTools.DatItems
 
         #region Sorting and Merging
 
-        /// <summary>
-        /// Get the dictionary key that should be used for a given item and bucketing type
-        /// </summary>
-        /// <param name="bucketedBy">Field enum representing what key to get</param>
-        /// <param name="lower">True if the key should be lowercased (default), false otherwise</param>
-        /// <param name="norename">True if games should only be compared on game and file name, false if system and source are counted</param>
-        /// <returns>String representing the key to be used for the DatItem</returns>
-        public override string GetKey(Field bucketedBy, bool lower = true, bool norename = true)
+        /// <inheritdoc/>
+        public override string GetKey(ItemKey bucketedBy, bool lower = true, bool norename = true)
         {
             // Set the output key as the default blank string
             string key = string.Empty;
@@ -381,11 +375,11 @@ namespace SabreTools.DatItems
             // Now determine what the key should be based on the bucketedBy value
             switch (bucketedBy)
             {
-                case Field.DatItem_MD5:
+                case ItemKey.MD5:
                     key = MD5;
                     break;
 
-                case Field.DatItem_SHA1:
+                case ItemKey.SHA1:
                     key = SHA1;
                     break;
 
diff --git a/SabreTools.DatItems/Enums.cs b/SabreTools.DatItems/Enums.cs
index 2d8b150c..a6e782d0 100644
--- a/SabreTools.DatItems/Enums.cs
+++ b/SabreTools.DatItems/Enums.cs
@@ -16,4 +16,22 @@ namespace SabreTools.DatItems
         Internal = 1 << 2,
         External = 1 << 3,
     }
+
+    /// <summary>
+    /// A subset of fields that can be used as keys
+    /// </summary>
+    public enum ItemKey
+    {
+        NULL = 0,
+
+        Machine,
+
+        CRC,
+        MD5,
+        SHA1,
+        SHA256,
+        SHA384,
+        SHA512,
+        SpamSum,
+    }
 }
\ No newline at end of file
diff --git a/SabreTools.DatItems/Media.cs b/SabreTools.DatItems/Media.cs
index 6e166cf9..700f61b1 100644
--- a/SabreTools.DatItems/Media.cs
+++ b/SabreTools.DatItems/Media.cs
@@ -289,14 +289,8 @@ namespace SabreTools.DatItems
 
         #region Sorting and Merging
 
-        /// <summary>
-        /// Get the dictionary key that should be used for a given item and bucketing type
-        /// </summary>
-        /// <param name="bucketedBy">Field enum representing what key to get</param>
-        /// <param name="lower">True if the key should be lowercased (default), false otherwise</param>
-        /// <param name="norename">True if games should only be compared on game and file name, false if system and source are counted</param>
-        /// <returns>String representing the key to be used for the DatItem</returns>
-        public override string GetKey(Field bucketedBy, bool lower = true, bool norename = true)
+        /// <inheritdoc/>
+        public override string GetKey(ItemKey bucketedBy, bool lower = true, bool norename = true)
         {
             // Set the output key as the default blank string
             string key = string.Empty;
@@ -304,19 +298,19 @@ namespace SabreTools.DatItems
             // Now determine what the key should be based on the bucketedBy value
             switch (bucketedBy)
             {
-                case Field.DatItem_MD5:
+                case ItemKey.MD5:
                     key = MD5;
                     break;
 
-                case Field.DatItem_SHA1:
+                case ItemKey.SHA1:
                     key = SHA1;
                     break;
 
-                case Field.DatItem_SHA256:
+                case ItemKey.SHA256:
                     key = SHA256;
                     break;
 
-                case Field.DatItem_SpamSum:
+                case ItemKey.SpamSum:
                     key = SpamSum;
                     break;
 
diff --git a/SabreTools.DatItems/Rom.cs b/SabreTools.DatItems/Rom.cs
index 4c0ec57c..d74b4737 100644
--- a/SabreTools.DatItems/Rom.cs
+++ b/SabreTools.DatItems/Rom.cs
@@ -625,14 +625,8 @@ namespace SabreTools.DatItems
 
         #region Sorting and Merging
 
-        /// <summary>
-        /// Get the dictionary key that should be used for a given item and bucketing type
-        /// </summary>
-        /// <param name="bucketedBy">Field enum representing what key to get</param>
-        /// <param name="lower">True if the key should be lowercased (default), false otherwise</param>
-        /// <param name="norename">True if games should only be compared on game and file name, false if system and source are counted</param>
-        /// <returns>String representing the key to be used for the DatItem</returns>
-        public override string GetKey(Field bucketedBy, bool lower = true, bool norename = true)
+        /// <inheritdoc/>
+        public override string GetKey(ItemKey bucketedBy, bool lower = true, bool norename = true)
         {
             // Set the output key as the default blank string
             string key = string.Empty;
@@ -640,31 +634,31 @@ namespace SabreTools.DatItems
             // Now determine what the key should be based on the bucketedBy value
             switch (bucketedBy)
             {
-                case Field.DatItem_CRC:
+                case ItemKey.CRC:
                     key = CRC;
                     break;
 
-                case Field.DatItem_MD5:
+                case ItemKey.MD5:
                     key = MD5;
                     break;
 
-                case Field.DatItem_SHA1:
+                case ItemKey.SHA1:
                     key = SHA1;
                     break;
 
-                case Field.DatItem_SHA256:
+                case ItemKey.SHA256:
                     key = SHA256;
                     break;
 
-                case Field.DatItem_SHA384:
+                case ItemKey.SHA384:
                     key = SHA384;
                     break;
 
-                case Field.DatItem_SHA512:
+                case ItemKey.SHA512:
                     key = SHA512;
                     break;
 
-                case Field.DatItem_SpamSum:
+                case ItemKey.SpamSum:
                     key = SpamSum;
                     break;
 
diff --git a/SabreTools.DatTools/DatFromDir.cs b/SabreTools.DatTools/DatFromDir.cs
index cbd2c497..addb77f8 100644
--- a/SabreTools.DatTools/DatFromDir.cs
+++ b/SabreTools.DatTools/DatFromDir.cs
@@ -337,7 +337,7 @@ namespace SabreTools.DatTools
                 SetDatItemInfo(datFile, datItem, item, parent, basepath);
 
                 // Add the file information to the DAT
-                string key = datItem.GetKey(Field.DatItem_CRC);
+                string key = datItem.GetKey(ItemKey.CRC);
                 datFile.Items.Add(key, datItem);
 
                 logger.Verbose($"File added: {datItem.GetName() ?? string.Empty}");