Craftsman Metric 1/2-in Drive 21mm 6-point Impact Socket

Triple Square Drive by Craftsman. Details:1/2-inch 21mm Metric Deep Impact Socket is engineered and constructed to endure high torque application with impact wrenches. This impact socket is specially designed to engage with the flats of fasteners to prevent rounding so it’s time to turn up the torque and turn tough jobs into easy ones.