.Premium Sub-Micrograin Solid Carbide Thread MillUN Series ThreadsFor Producing Internal & External ThreadsALTIN CoatedALTIN Coating: A high performance coating for milling stainlesssteels, carbon steels, alloy steels, and cast iron. These Kodiak Cutting Tools® solid carbide multiple-form thread milling cutters are designed to travel around the workpiece in a helical interpolation.