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 Dwa1181 21-Piece Set Black Oxide Coated Hss Twist Drill Bit Set

Dewalt Dwa1181 21-Piece Set Black Oxide Coated Hss Twist Drill Bit Set

Product ID: 389134512

Details

Brand
DEWALT
Cutting angle string
135 Degrees
Finish type
Brushed
Material
High Speed
Shank type
Straight

🔩135° split-point precision

⚙️21-piece versatile set

🛡️Black oxide corrosion resistance

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R$495

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Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Drill Like a Pro, Last Like a Legend

ALL MATERIAL MASTERY - Engineered for metal, hardwood, PVC, fiberglass & more—one set to rule them all.
OPTIMIZED CHIP EJECTION - Parabolic flute design accelerates debris removal for faster, smoother drilling.
DEEP HOLE DRILLING CONTROL - 31° helix angle balances aggressiveness for perfect deep-hole performance.
CORROSION RESISTANT COATING - Black oxide finish extends bit life, keeping your toolkit sharp and ready.
PRECISION ON CONTACT DRILLING - 135° split-point tips prevent walking, delivering clean, accurate starts every time.

The DEWALT DWA1181 21-piece black oxide coated HSS twist drill bit set offers professional-grade versatility and durability. Designed with a parabolic flute for efficient chip ejection and a corrosion-resistant black oxide finish, these bits excel on metal, wood, PVC, and fiberglass. Featuring 135° split-point tips for precise starts and a 31° helix angle for controlled deep drilling, this set is a must-have for any serious DIYer or professional.

Specifications

ASIN	B079VJMH6T
ASIN	B079VJMH6T
Best Sellers Rank	#56,151 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #239 in Power Drill Bit Sets
Brand Name	DEWALT
Customer Reviews	4.8 4.8 out of 5 stars (5,594)
Customer reviews	4.8 4.8 out of 5 stars (5,594)
Cutting Angle String	135 Degrees
Date First Available	25 May 2016
Department	Unisex-Adult
Finish Types	Brushed
Global Trade Identification Number	00885911426749
Included Components	(1) 21 Piece drill bit set
Is Discontinued By Manufacturer	No
Item Dimensions	22.2 x 3.5 x 22.2 centimeters
Item Type Name	Drill Bits
Item Weight	454 g
Item model number	DWA1181
Manufacturer	DEWALT
Manufacturer	DEWALT
Material Type	High Speed Steel (HSS)
Minimum Bore Diameter	2 Millimeters
Model	DWA1181
Number of Flutes	2
Number of Pieces	1
Part Number	DWA1181
Point Style	Split Point
Product Dimensions	22.23 x 3.51 x 22.23 cm; 453.59 g
Set Name	Multi-Material Drill Bit Set (21 Pieces)
Shank Type	Straight
Surface Recommendation	Fiberglass,Metal,Plastic,Pvc,Wood
Tool Flute Type	Parabolic
UPC	885911426749

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