Century Drill And Tool 13 Piece Brite Drill Bit SetSet includes 1 16 to 1 4 by 64ths drill bits Brite industrial drill bits feature premium grade high speed steel for general purpose drilling in wood, metal and plastic No center punch needed: Century 135 degree quick cut points are self centering and penetrate faster with less pressurewill not walk or wander at the starting surface Ground flats on the shank providing tight chucking, even with keyless chucks