The TonePros T3BP has many improvements over standard Nashville bridges including intonation adjustment on the pickup side, phillips head saddle adjustment screws, and pre-notched saddles for quick installation. It has standard small post and standard threaded inserts, which are the same as TonePros TP6. Direct retrofit for most USA guitars without modification. (This bridge is engineered with permanent saddles that require no modification. Removal or modification will result in damage to the bridge. If interested in a comparable model with removable saddles please see )