These 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.

They 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).

The sizes of Wera 840/1 Z Hex Plus / Allen Key Screwdriver Bits that can be commonly used on guitars are the following:

• 1.5 mm, metric hardtail and Stratocaster tremolo bridge saddle height adjustment screws (Gotoh, Mexican Fender etc.), most metric wraparound bridge intonation screws
• 2 mm, Gotoh 510UB intonation screws
• 2.5 mm, Floyd Rose Original and Special, Schaller and Gotoh 1996T double locking tremolo saddle lock screws, Gotoh 510UB post height screws
• 3 mm, Floyd Rose Original and Special, Schaller and Gotoh 1996T double locking tremolo nut locking screws, string lock screws and post height adjustment screws
• 4 mm, Truss rods
• 5 mm, Truss rods
• 0.05", American made Fender Stratocaster and Telecaster saddle height adjustment screws
• 1/16", American made Fender bass saddle height adjustment screws, imperial wraparound intonation screws (Gibson, PRS etc.)
• 7/64", Some Fender bass saddle intonation screws
• 1/8", American made Fender guitar truss rod nuts (Stratocaster and Telecaster etc.)
• 3/16", American and Mexican made Fender bass and most Mexican made Fender guitar truss rod nuts

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