3/8 Inch Drive x 3/8 Inch Deep 6-Point Socket Quantity:1 and the tightly mated fit

and the tightly mated fit results in a bit that won't loosen over time or under stress

Part Number: 62F400HCSL9Y

Part Number: DUR1210-95

and letter sizes

Part Number: DUR297B-95

3/8 Inch Drive x 3/8 Inch Deep 6-Point Socket Quantity:1 and the tightly mated fitDeep 6 point socket opening provides an ideal, exact fit for hex shaped fastener heads Socket geometry is designed to apply force to flat sides of fasteners and not the corners, preventing round off Deep length sockets reach into wells and accommodate the excess threads of longer shafts Extra large die stamped size markings are easy to read and cant wear off Polished, chrome plated finish easily wipes clean and is highly resistant to corrosion Four