Genius Tools 619+6990, Star Bit Socket T-90 Size 3/4 Inch Drive High Strength S2 Steel. 3/4" Inch Drive Size with an overall length of 95mm (or 3.74 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.