The Allparts Tremol-No is a patented device that is added to an electric guitar equipped with a tremolo/vibrato unit. If you break a string or drop tune the low E to D, the other strings will stay in tune. It allows guitarists 3 playing options: - tremolo on - in this position your tremolo functions as normal. You can raise or lower the pitch of notes with the tremolo. -tremolo off - in this position, you'll enjoy the benefits of a hardtail bridge, where the tremolo doesn't move at all; no lowering or raising of a note's pitch via the tremolo, and the other strings remain in tune should you break one of them. -tremolo dive only mode - in this position, you can only lower the pitch of notes. Tremol-No comes in 3 versions: 1-PIN-TYPE (SOLD ON THIS PAGE) is designed to work with tremolo blocks that do not have a flat base, such as those that are rounded or beveled (to allow for more tremolo travel). 1.5mm SPRING HOLE DIAMETER IS REQUIRED TO USE THE PIN-TYPE Recommended by Tremol No for the following: Ernie Ball/Music Man tremolos, Fender Standard 2-screw/post, Fender Standard 6-screw, G&L tremolo systems (Requires new claw screw holes), Godin tremolo systems, Gotoh 1055, Gotoh 1088, Gotoh 1099, Gotoh 510FT, Ibanez FAT 10, Wilkinson VS-100C, Wilkinson VS-100G, Wilkinson VG-300, Wilkinson-Gotoh VSVG, Fender Vintage-style (6-screw), Kahler (2500 Traditional, 2710 Killer, 2720 Spyder, 2750 Steeler), Schaller Model 370, 371, 1370, 5370, 5371, 15370, 5375, 5376, 15373, TRS, TRS-101, ABM Fulcrum 2-LARGE CLAMP type is designed to work with tremolo blocks that are thicker than 10mm on vintage Strats, PRS, and upgraded FR tremolo blocks. SEE AMAZON Listing for LARGE CLAMP fit. 3-SMALL CLAMP type is designed to work with tremolo blocks up to approx. 9mm in thickness.This includes almost all Floyd Rose and FR-licensed tremolos. SEE AMAZON Listing for SMALL CLAMP fit.