Glued to MusicWera 840/1 Z Hex Plus / Allen Key Screwdriver Bits 1/4\"" Hexagon Drive (8 mm, Single)\nThese Wera 840/1 Z Hex Plus / Allen Key Screwdriver Bits use a standard 1/4\"" hexagon drive (for 1/4\"" socket head screwdrivers) and are from their tough Z range of screwdriver bits.\nThey are made with Wera's Hex-Plus technology that's designed to greatly reduce the risk of stripping screws or nuts by operating with a larger contact surface (driving from the flats of the hexagon instead of the corners). The size of driver is marked on the hex bits for quick and easy identification. We stock the Wera Kraftform Kompakt 812/1 Magnetic 1/4\"" Hexagon Bit Holding Screwdriver, which is compatible with these bits, as a separate item (Wera product code: 05051205001).\nThe sizes of Wera 840/1 Z Hex Plus / Allen Key Screwdriver Bits that can be commonly used on guitars are the following:\n--1.5 mm, metric hardtail and Stratocaster tremolo bridge saddle height adjustment screws (Gotoh, Mexican Fp