TEKTON 3/8-Inch Drive Deep Impact Socket Set, Inch, Cr-V, 12-Point, 5/16-Inch - 1-Inch, 12-Sockets | 47921 High-torque, 12-point socket design grips the flat sides of fasteners, not just the corners, preventing round-off Extra-deep broach accommodates longer fasteners High-contrast permanent laser etched size markings are easy-to-read, even in low light Made from forged and heat treated chrome vanadium steel with a corrosion-resistant black phosphate finish Meets or exceeds ANSI performance standards