TEKTON 47809 1/2-Inch Drive by 18 mm Deep Impact Socket, Cr-V, 6-Point Engineered for use with impact drivers High-torque, 6-point opening grips flat sides of fasteners, not corners, preventing round-off Extra-deep broach accommodates longer fasteners Large, high-contrast size marking is permanently laser etched and easy to read, even in low light Made of premium chrome vanadium steel with a protective black phosphate finish