Ideal for fastening screws in limited access locations or requiring more torque,Wiha Black Finish Hex Keysconsist ofWihapremium quality tool steelengineered for strength and durability, boastCNC precision machinedforreducedcamout,chamfered endsfor smooth fastener engagement,no cut off burrs or impact distortions,black oxide finishfor durabilty. You can buy with confidence knowing that Wiha stands behind our products with what we believe is the best No Hassle Guarantee in the industry.