Genius Tools 665222, Impact Socket 11/16 Inch, 3/4 Inch Drive, High-Strength CR-Mo Steel, Durable Heavy-Duty Design. 3/4" Inch Drive Size with an overall length of 51mm (or 2.01 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.