The ABM 2500 Tune-o-matic is a premium quality ABR-1 style bridge supplied with 6-32 imperial threaded bridge posts and post spacing to match the classic Gibson ABR-1. The bridge is milled from a solid block of brass for superior quality and tone and the machined brass saddles are reversible to give extra intonation room on the bass strings to compensate for the narrower ABR-1 body width. The saddle intonation screws mount through the body so there is no need for a retainer wire to keep them in place during restringing and means no rattle or buzz from the wire. The saddles are unnotched to allow them to be slotted to the correct string spacing and gauge for your guitar (saddle spacing is standard 52 mm / 2.9" E-e). The bridge comes with a spare saddle, intonation screw and retainer clip for a long service life.