The Grainger 12-16 Threaded Shank Drill Bit is a high-speed steel bit with a 1/2" hex shank and a cutting diameter of 12-16". It has a 118 degree point angle and is designed for use in metalworking applications. The bit features a threaded shank that allows for quick changes between tools. Made in the USA, this drill bit can bore holes in steel, iron, bronze, aluminum and other metals. It is ideal for use in drill presses, magnetic base drills, and milling machines. With proper use, this durable drill bit provides accurate cuts and smooth hole boring.