are these covered under lifetime warranty?

I don’t believe so as they are considered consumables.

How do they last drilling stainless steel?

I think they will work fine as long as you use plenty of cutting oil, low rpm, light to moderate pressure, and periodically stop to clear the chips. I used the 1-3/8" to drill two holes through 1/2" thick (double 1/4" plates) cold rolled steel (1010 or 1020) and was able to do it with my 1/2" variable speed handheld drill but had to take my time. So the bit wouldn't grab. I was in a tight area where there wasn't enough room to use a mag mount drill press and I was really surprised how well this cutter maintained its sharpness. Good luck with your project!

The picture does not match the description. Which is it?

The description does not match the picture, David is correct.

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Carbide Hole Cutter Set 4 Piece KLEIN TOOLS 31872

Carbide Hole Cutter Set 4 Piece KLEIN TOOLS 31872

Product ID: 177460840

Details

Brand
KLEIN TOOLS
Cutting diameter
5 Millimetres
Finish type
Brushed
Material
Carbide
Shank type
Straight

⏱️Quick hole cutting up to 5mm thick

⚙️4-piece carbide-tipped precision

🛡️Integrated flange for depth control

Carbide Hole Cutter Set 4 Piece KLEIN TOOLS 31872

Product ID: 177460840

Details

Brand
KLEIN TOOLS
Cutting diameter
5 Millimetres
Finish type
Brushed
Material
Carbide
Shank type
Straight

⏱️Quick hole cutting up to 5mm thick

⚙️4-piece carbide-tipped precision

🛡️Integrated flange for depth control

RM872

Duties & taxes included

In stock

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Description

🔧 Cut with Confidence, Drill with Precision!

STAY ON TARGET - Split point pilot drill bit prevents bit walking for flawless hole placement every time.
SAFETY FIRST DESIGN - Integrated flange stops drilling beyond sheet metal, protecting your work and tools.
LEGACY OF EXCELLENCE - Crafted by Klein Tools, a family-owned brand with 160+ years of trusted American engineering.
PRECISION MEETS POWER - Cuts stainless steel, mild steel, iron, copper & brass sheets up to 3/16-inch (5mm) thick with unmatched accuracy.
BUILT FOR PROFESSIONALS - Includes 3 essential sizes plus an extra pilot bit to cover conduit and pipe sizes from 1/2-inch to 1-inch.

The Klein Tools 31872 Carbide Hole Cutter Set is a professional-grade 4-piece kit designed for quick, precise holes in metals up to 5mm thick. Featuring carbide-tipped cutters, a split point pilot bit to prevent walking, and an integrated flange for depth control, it covers common conduit sizes from 1/2-inch to 1-inch. Trusted by pros for over 160 years, this set delivers durability, accuracy, and safety in one compact package.

Specifications

ASIN	B003CCR97A
Brand	KLEIN TOOLS
Country Of Origin	Taiwan
Customer Reviews	4.7 4.7 out of 5 stars (1,094)
Cutting Diameter	5 Millimetres
Finish Types	Brushed
Global Trade Identification Number	00092644318726
Included Components	Sizes: 7/8'' (2.2 cm), 1-1/8'' (2.9 cm), 1-3/8'' (3.5 cm), Extra Pilot Bit, Case
Item Dimensions	15.2 x 10.2 x 10.2 centimetres
Item Type Name	Carbide Hole Cutter Set 4 Piece Klein Tools 31872
Item Weight	1.4 Pounds
Manufacturer	Klein Tools
Manufacturer Part Number	31872
Material	Carbide
Model Number	31872
Number of Flutes	4
Number of Pieces	1
Point Style	Split Point
Product Warranty	Normal Life of Product
Shank Type	Straight
Surface Recommendation	Brass,Copper,Iron,Plastic,Stainless Steel,Steel
Tool Flute Type	Straight
UPC	092644318726
Unit Count	1.0 count

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