ResoMax tune-o-matic bridges are made from our proprietary lightweight ResoMax alloy that will leave each note dripping in tone and harmonics. Exclusive to the ResoMax System, the AutoLock™ locking feature magnetically secures your bridge and tailpiece at all times without a tool to use or lose, making restringing quick and simple.This lightweight, high strength bridge will increase harmonic content and leave your guitar dripping with tone. It comes preloaded with ResoMax alloy saddles to retain the vintage look and tone of your guitar. This is a great option to upgrade or replace the existing bridge on your Epiphone, EST, LTD, Schecter or many other import electric guitar. 6mm posts Post Spacing 2 29/32` (73,8mm) String Spacing 2 1/16` (52,4mm) Radius 12` Thread M8 x 1.25