21-Piece HSS Twist Drill Bit Set with 135° Split Points, Black Oxide Coating and Parabolic Flutes for Deep Holes
21-Piece HSS Twist Drill Bit Set with 135° Split Points, Black Oxide Coating and Parabolic Flutes for Deep Holes
A 21-piece HSS twist drill set handles general-purpose holes in metal, hardwood, softwood, PVC, plastic and fiberglass. The 135-degree split-point tips start on contact to limit walking, while black oxide coating improves corrosion resistance for dependable use across repairs and construction projects.
Parabolic flutes eject chips efficiently from deeper holes, and a 31-degree helix tempers the cutting action for better control. Sizes from 1/16 through 1/2 inch include duplicates of several common diameters, keeping a backup ready if a frequently used bit wears. Choose one set or a five-set pack for a shared shop or multi-crew inventory.
Specifications
- Product: HSS twist drill bit set
- Pieces: 21
- Material: high-speed steel
- Finish: black oxide / black and gold listing
- Point: 135-degree split point
- Flute: parabolic
- Helix: 31 degrees
- Shank listing: straight
- Sizes: 1/16 to 1/2 inch with selected duplicates
- Compatible materials: metal hardwood softwood PVC plastic and fiberglass
- Pack options: one set or five sets
- Set dimensions: 8.75 x 1.38 x 8.75 inches
- Weight: 16 ounces
- Brand: DEWALT
- Model: DWA1181
Frequently Asked Questions
What materials can the 21-piece set drill?
The bits are listed for compatible metal hardwood softwood PVC general plastic and fiberglass.
Why use a parabolic flute for deep holes?
The open flute shape improves chip ejection which reduces clogging and heat buildup as the hole deepens.
Which sizes have duplicates?
The set includes duplicate 1/16 5/64 1/8 3/16 and 1/4-inch bits according to the listed inventory.
Can I buy more than one complete set?
Yes. The variants offer one 21-piece set or a five-set pack for broader workshop stocking.