Alfa Tools SFTB170914 8-36" High Speed Steel Spiral Fluted Bottoming Tap Set (12 Pack) - Perfect for Threading Holes in Metal, Wood, and Plastic for DIY and Professional Projects

Alfa Tools Spiral Fluted Taps - High-Speed Steel, Ground Thread. Spiral fluted taps draw chips out of a tapped hole, thereby preventing clogging and re-cutting of chips. Will bridge a keyway or other slot inside a hole without binding. Can be used for tapping most materials, especially mild steel, aluminum, magnesium, copper and brass in blind holes. Chamfer: Plug (3 to 5 threads) Bottoming (1 to 2 threads).