Genius Tools 282506, Hand Socket 3/16 Inch 1/4 Inch Drive Durable Chrome Vanadium Steel. 1/4" Inch Drive Size with an overall length of 25mm (or 0.98 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.