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

⏱️Fast hole cutting up to 3/16-inch thick

⚙️Precision carbide tips for clean cuts

🛡️Integrated flange prevents over-drilling

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€ 278.67

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Description

🔧 Cut Smart, Cut Fast, Cut Like a Pro!

SPEED MEETS CONTROL - Split point pilot drill bit eliminates bit walking, ensuring fast, accurate starts every time.
VERSATILE SIZE RANGE - Includes 7/8", 1-1/8", 1-3/8" cutters plus an extra pilot bit, perfect for conduit and pipe sizes from 1/2" to 1".
BUILT TO PROTECT PERFORM - Integrated flange guards against over-drilling, preserving your work surface and tool longevity.
CUT WITH SURGICAL PRECISION - Carbide-tipped cutters deliver clean, burr-free holes in stainless steel, mild steel, iron, copper, and brass up to 5mm thick.
TRUSTED LEGACY PROFESSIONAL GRADE - Crafted by Klein Tools, a family-owned brand since 1857, engineered for durability and daily jobsite demands.

The Klein Tools 31872 Carbide Hole Cutter Set is a 4-piece professional-grade kit designed for quick, precise hole cutting in metals up to 3/16-inch thick. Featuring carbide-tipped cutters and a split point pilot bit to prevent walking, it includes three popular sizes plus an extra pilot bit. An integrated flange prevents over-drilling, making it ideal for conduit and pipe sizes from 1/2" to 1". Trusted by professionals since 1857, this set combines precision, durability, and versatility for demanding metalworking tasks.

Specifications

ASIN	B003CCR97A
Brand	KLEIN TOOLS
Country Of Origin	Taiwan
Customer Reviews	4.7 4.7 out of 5 stars (1,081)
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 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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