Master Mechanic, 13/64" x 3-5/8", 4341 high-speed steel, black oxide drill bit. 135 split point, jobber length, straight shank, 135-point angle with 4 cutting edges which eliminate walking and provide fast penetration. Black oxide tempering treatment reduces frictional resistance and improves chip flow. Recommended for wood, plastic, wallboard, plywood, and soft metals such as aluminum, brass, and bronze. For occasional use in stainless steel and other hard metals. Carded.