This Hosco 5 in 1 Hex Wrench Truss Rod Adjustment Tool has five allen key sizes that magnetically attach to the handle for quick and easy changes so you can work on a number of different guitars with just one tool. The hex wrenches cover the most common truss rod sizes including 3/16" (the straight hex wrench) for Fender Mexico guitars and most Fender basses, 1/8" for Fender American guitars, 4 mm for most Asia made guitars, 5 mm for Martin acoustic guitars and a long length 5 mm for hard to reach sound hole adjusted truss rods.

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