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A favorite of professional mechanics around the world! The 4mm 5mm 6mm Balldriver Y-Wrench allows for quick insertion into bolt heads from a wider variety of angles. This baby is made from heat treated Bondhus Protanium, so it will last a lifetime. Plus, it's made in the USA!
Having a balldriver allows you to tighten screws at up to a 25 degree angle!
Note: Balldrivers are not intended for high torque situations.