Viking Type 21 Metric HSS Spiral Point Plug Taps are designed to be a chip clearing tap for through-hole tapping applications. Also known as Gun Taps, these have spiral-point flutes that push the chips ahead of the tap and out of through holes. Because they don't need to be reversed to prevent chip buildup, they produce threads more efficiently than standard taps and are particularly suitable for production work. They're made of high-speed steel for use on most metal and plastic. With a square shank, they're compatible with tap wrenches and tap holders for drill presses and milling machines. All Spiral Point taps have a plug chamfer with 3-5 chamfered cutting threads, so they're suitable for start-to-finish tapping.
Viking taps are made in America of High Speed Steel with a bright finish. They can be used for tapping by hand or under power.