Ameta 35 0516 1 5 16" M35 Steel, Cobalt Drill Bit, 1 2" Hex Shaft, 6" Long Cast Iron Pump birth defects and other reproductive Spark Plug Socket birth defects and other reproductive harm providing you a stress free way to apply torque to fasteners even in tight spaces and difficult anglesAnti corrosion coating with a matte finish for easy cleaning and wiping of tools for longer tool lifeHigh visibility and permanent stamps for quick size selectionHolder included for easy tool storage and organization Every size for every application Diameter: 1 5 16 Made of high speed steel grade HSS C05 and Cobalt M35 surpassing the M2 standard