Brite industrial drill bits feature premium grade high speed steel for general purpose drilling in wood, metal, and plastic. No center punch needed: Centurys 135 quick-cut points are self-centering and penetrate faster with less pressure. Drill bit will not walk or wander at the starting point. Ground flats on the shank providing tight chucking, even with keyless chucks. Flats are ground on drills 3/16 and up.