Stahlwille 58261010 5/16" Bit Holder Insert Tool - 9mm x 12mm Mount

5/16" hex bit holder insert tool for torque wrenches with a 9mm x 12mm rectangular drive.The hex socket has a collar-thrust springMade from nickel which has been drop forged, then hardened and cooled in an oil bath before getting a chrome plating, making this torque wrench ring insert tool durable and chip resistant.