Glued to MusicWera 842/1 Z Ball End Hex / Allen Key Screwdriver Bits 1/4\"" Hexagon Drive (4 mm)\nThe Wera 842/1 Z Ball End Hex / 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.\nThe screwdriver bits have a hexagonal ball end tip which means the screw can be adjusted even if the tool is not directly on centre, great for hard to reach screws. The size of driver is marked on the hex bits for quick and easy identification. We stock compatible bit holding screwdrivers like the Wera Kraftform Kompakt 812/1 Magnetic 1/4\"" Hexagon Bit Holding Screwdriver (Wera product code: 05051205001) and the Wera Kraftform Kompakt 817 R Bit Holding Screwdriver with Rapidaptor Quick Release Chuck (Wera product code: 05051482001) as separate items.\nThe Wera 842/1 Z Ball End Hex / Allen Key Screwdriver Bits that can be commonly used on guitars are the following:\n--2.5 mm, Floyd Rose Original and Specialp