Is the flat shank on all bits?

The shank is round for the bits sized 1/16” to 1/8”. For bits sized 13/64” to 1/2”, they have the three flat shank.

Will these drill thru stainless?

YES. The DWA1181 DEWALT 21-pack black oxide twist drill bit set is ideal for general-purpose drilling materials like metal. It’s no secret that stainless steel is in fact a metal. I’ve used the 9/16” version (not included in this set, but exact same parabolic flute 31 degree helix design) to drill perfect holes in very hard 1/4” thick stainless steel. Use a drill press, not a hand held drill, go slow and use a good lubricant like Anchor. The bit cuts very smoothly and the resulting hole is smooth and shiny inside. Just my 2 cents.

Are these universal? Do they fit most drills?

Yes, the largest drill bit shank in the DWA1181 is a 1/2".

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DEWALT Drill Bit Set, 21-Piece, 135 Degree Split Point, 31 Degree Helix, Black Oxide Coated, For Plastic, Wood and Metal (DWA1181)

DEWALT Drill Bit Set, 21-Piece, 135 Degree Split Point, 31 Degree Helix, Black Oxide Coated, For Plastic, Wood and Metal (DWA1181)

Product ID: 314046508

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Details

Material
High Speed
Finish Type
Brushed
Shank Type
Straight
Cutting Angle String
135 Degrees
Brand
DEWALT

🌀31° helix angle for smooth deep drilling

⚙️135° split-point tip for precise starts

🛡️Black oxide coating resists corrosion

Description

🔩 Drill Like a Pro, Last Like a Legend

BUILT TO LAST - Black oxide coating enhances durability and corrosion resistance for long-term use.
PRECISION ON CONTACT - 135° split-point tips prevent walking and ensure exact drilling every time.
OPTIMIZED CHIP EJECTION - Parabolic flute design accelerates debris removal, keeping your workflow smooth and efficient.
EFFORTLESS DEEP DRILLING - 31° helix design reduces bit aggressiveness for clean, deep holes without wear.
VERSATILE MATERIAL MASTERY - Engineered for plastic, wood, metal, PVC, and fiberglass — your all-in-one drilling solution.

The DEWALT 21-piece drill bit set features high-speed steel construction with a black oxide finish for corrosion resistance. Its 135° split-point tips deliver precise, walk-free starts, while the 31° helix angle and parabolic flute design optimize chip ejection and reduce bit wear. Perfectly suited for drilling into plastic, wood, metal, PVC, and fiberglass, this set is engineered for durability and versatility in professional and DIY projects alike.

Specifications

Material	High Speed Steel (HSS)
Finish Type	Brushed
Shank Type	Straight
Cutting Angle String	135 Degrees
Brand	DEWALT
Item dimensions L x W x H	8.75 x 1.38 x 8.75 inches
Tool Flute Type	Parabolic
Point Style	Split Point
Surface Recommendation	Fiberglass,Metal,Plastic,Pvc,Wood
Number of Flutes	2
UPC	885911426749
Manufacturer	DEWALT
Number of Pieces	1
Part Number	DWA1181
Item Weight	1 pounds
Product Dimensions	8.75 x 1.38 x 8.75 inches
Item model number	DWA1181
Is Discontinued By Manufacturer	No
Size	One Size
Color	Multi
Style	Classic
Finish	Brushed
Pattern	Solid
Shape	Rectangular
Voltage	120
Item Package Quantity	1
Included Components	(1) 21 Piece drill bit set
Batteries Included?	No
Batteries Required?	No

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