Genius Tools 437816, Deep Hand Socket 16mm 1/2 Inch Drive 12-Point High-Strength Steel. 1/2" Inch Drive Size with an overall length of 78mm (or 3.07 Inches). Made from Chromium-vanadium Steel Alloy for high strength and durability while having anti-corrosive properties. Sizes are stamped for permanent and easy identification of size.