Ideal for hole making in sheet metal and other thin materials. M35 high speed steel stays sharp longer for fast cutting and long service life. Split point, two flute design provides fast penetration and maximum chip clearance. Gold finish minimizes heat build up and reduces friction, increasing life and performance. Three flat shank prevents slipping in chuck. Step increments for 1/4, 25/64, 35/64, 11/16, 13/16, 7/8, 1, 1-1/8, 1-7/32, 1-1/4, 1-3/8 inch.