The TonePros TP6 is a locking version of the Nashville type standard small post and threaded insert as found standard on current USA Gibson Les Paul GT and Gibson SG GT models. (Same format as LP Standard & LP Custom). This bridge has un-notched saddles for professional installation. It can be fit with many standard sized Piezo, aftermarket graphite, or exotic saddle materials. Direct retrofit for most USA guitars without modification. Post to Post Spacing: 2.93 inches/ 74.mm