Performance Tool M742-42 3/4-Inch Diameter 1-5/16-Inch DW Impact Socket Size: 3/4" Dr 1-5/16 DW Impact Socket Drop forged chrome molybdenum steel for strength and durability Rounded corners for a tighter grip Large size laser etching for easy identification Plated and black oxide coated for protection from rusting Optimum wall thickness for strength and access on fasteners with restrictions