Century Drill & Tool
Century Drill & Tool 24021 21-Piece Black Oxide Drill Bit Set
A 21-piece black oxide drill bit set made from M2 high-speed steel with self-centering 135° points for steel, wood and plastic
- ColorTransparent
- 21-piece set covers 1/16" to 3/8" by 64ths
- M2 high-speed steel delivers long life in steel, wood and plastic
- 135° quick-cut points self-centre without a centre punch
- Aerospace NAS 907-B specification ensures consistent quality
- Made in the U.S.A. with industrial-grade materials
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.
Highlights
- 21-piece set covers 1/16" to 3/8" by 64ths
- M2 high-speed steel delivers long life in steel, wood and plastic
- 135° quick-cut points self-centre without a centre punch
- Aerospace NAS 907-B specification ensures consistent quality
- Made in the U.S.A. with industrial-grade materials
Specifications
| Brand | CENTURY DRILL & TOOL |
|---|---|
| Color | Transparent |
Questions about this item
How often will the 135° quick-cut points need resharpening?
The M2 high-speed steel holds its edge well; resharpen when cutting slows or the bit walks, using a bench grinder set to 135° to match the original geometry.
Which material stops the bits first during a long drilling session?
Hardened steel or thick angle iron generates the most heat and wears the cutting lips fastest; wood and plastic cause minimal wear.
How hot does the black oxide coating get when drilling steel continuously?
Expect the shank to become too hot to touch after several holes in flat bar or tubing; pause to let the bit cool and apply cutting oil to extend life.
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