Made from high quality HSS steel The ladder of its unique structure, ideal for using to cut holes in a variety of materials including steel, brass, wood, plastic, etc Heat treated & highly polished. Drills perfectly round holes in steel, brass, plastic, wood etc Work while water cooling, can effectively extend the service life of drill bit Recommend drilling rate of 250-400 RPM
Material: High speed steel 4-22mm length: 75mm / 2.95inch Shank: 6.35 x 6.35 x 23mm / 0.25 x 0.25 x 0.91inch Package Weight: 56g / 1.98oz