The Grainger 7/16" Threaded Shank Drill Bit is made of high speed steel and has a black oxide finish. It features a 135 degree split point tip for fast, easy drilling starts. The drill bit has a 7/16" diameter and is 6" long overall. It has a 1/4" hex shank to fit power drills. The drill bit can drill through metal, wood, plastic and other materials. It is designed for high performance and has increased tool life compared to standard drill bits. The black oxide coating helps resist corrosion. This is a high quality threaded shank drill bit good for industrial, construction and home use.