Century Drill & Tool 24021 21-Piece Black Oxide Drill Bit Set

21-Piece Pro-Grade Black Oxide Drill Bit Set

The Century Drill & Tool 24021 set contains 21 black oxide drill bits ranging from 1/16" to 3/8" by 64ths. Manufactured in the U.S.A. from M2 grade high-speed steel, they are built to Aerospace NAS 907-B specifications for durability and long life.

135° Quick-Cut Points Eliminate Center Punching

Each bit features a 135-degree self-centering point that penetrates faster with less pressure. The geometry prevents the bit from walking or wandering at the starting surface, saving setup time when drilling steel, wood, or plastic.

Ideal for Multi-Material Workshop Drilling

Suits users who need a USA-made, M2 steel set covering common fractional sizes for steel flat bar, angle iron, tubing, wood, and plastic. Not suited for buyers requiring metric sizes, larger diameters beyond 3/8", or specialized bits for masonry, glass, or hardened steel applications.