These Wera 3950 Stainless Steel Hex Plus Ball End Allen Key / Hex Wrenches are available in common sizes for guitar adjustment and the Allen keys are colour coded for easy identification.

The wrenches are made from stainless steel for ultimate corrosion protection and are vacuum ice hardened, 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 and allows up to 20% more torque to be applied over a standard hex wrench. The long arm of these Allen keys features a hexagonal ball end which means the screw can be adjusted even if the tool is not directly on centre, great for hard to reach screws. The wrenches are made from round stainless steel and only hexagonal at the tips, this makes the wrench more comfortable to hold and also more durable, to further increase comfort the wrenches have a rubberised sleeve which is also colour coded and labelled with the size, this is part of Wera's "Take it easy" tool finder system so you can quickly find the size of wrench you need, the sizes are also lasered onto the key to make the markings abrasion proof.

The sizes of Wera 3950 Hex Plus Allen Keys that can be commonly used on guitars are the following:

• 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

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