Dormer E020 Powdered-Metal Steel Machine Spiral Point Threading Tap, Gold Oxide Finish, Round with Square End Shank, Plug Chamfer, 1/2"-13 Thread Size, 9.00mm Shank Diameter (Pack of 1) Powdered metal substrate offers superior performance that approaches that of solid carbide tools but with the toughness and shock-resistance of high-speed steel Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools; performance is similar to uncoated tools Right-hand cut tools have a cutting action that engages when they are run in a clockwise direction Round with square end shank, spiral point Through hole