This is the real thing! This is the new locking version of the standard Tune-O-Matic and Tailpiece that secures solidly to your guitar and won "t come loose or fall off when the strings are removed. These TonePros System II Components are the same that you will find installed on all the top new guitars direct from the factory. These bridges & tails are the finest quality OEM components and lock in solid creating perfect intonation and singing sustain. You won "t believe the difference, and you will never go back! This model fits your Epiphone Les Paul, SG, 335,as well as most other guitars with large posts and metric threads. Bridge Stud Diameter: 6 mm Slotted Top Bridge Center To Center Spacing: 2.95 Saddle Spacing: 10.4 mm