TEKTON Long Arm Star Key Wrench Set, T10-T50, 9-Piece | 25291 Heat treated chrome vanadium steel with black-oxide finish Precisely-sized, chamfered ends insert smoothly into fastener head, reducing wear Hinged case opens flat, making it easier to get wrenches in and out High visibility sizes marked on case for fast size selection Long arm wrenches provide extra reach and greater torque