Genius Tools 665266, Impact Socket 2-1/16 Inch Size 3/4 Inch Drive Heavy-Duty CR-Mo Steel. 3/4" Inch Drive Size with an overall length of 70mm (or 2.76 Inches). Made from Chromium Molybdenum Alloy Steel for high strength and durability while having anti-corrosive properties. Sizes are stamped for permanent and easy identification of size.