1-INCH DRIVE - Heavy-duty 1-inch drive, impact grade 41mm thin wall deep socket ideal for industrial and construction useDURABLE STEEL TOOL - This metric socket is made from drop forged, heat-treated chromoly steel for long lasting durabilityCORROSION RESISTANT - Rust and corrosion resistant black phosphate protective coatingLASER ETCHED - Socket has laser etched size markings and callouts that are easy to read and won't fade or rub awayTHIN-WALLED - Thin walled design can access fasteners located in recesses that are too narrow for regular sockets6-POINT DESIGN- 6-Point socket design grips the sides of fasteners, not corners, reducing the chance of wear or rounding -BALL DETENT RECESS - A ball detent recess on the drive end helps secure the socket onto ratchets, adapters, and extensions