Ideal for fastening screws in limited access locations or requiring more torque, Wiha Black Finish Hex Keys consist of Wiha premium quality tool steel engineered for strength and durability, boast CNC precision machined for reduced cam out, chamfered ends for smooth fastener engagement, no cut off burrs or impact distortions, black oxide finish for 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.