How well do these hold up against carving into steel? Like for example if I wanted to add detail to a steel rod.

Hold up well. Better than I expected. I use them for finish work on guns.

The description says 1/8" shank, but the illustration shows 3 mm - which is it? (1/8" does not equal 3 mm. 1/8" = 3.2 mm.) Thanks!

The shank is 1/8th inch, I just pulled one out a measured it.

Are these good for shaping leather?

"Shaping leather"? Let's see, assuming you want to add texture or even holes to your leather, and you wanted to use drill bits, it seems like overkill to use these carbide bits, even a cheap set that can carve very hard materials at least until they wear out. I did a little net search and most references to drill bits and leather just used regular metal bits or hand tools. Careful when drilling through leather as you might start making holes in whatever is underneath. One neat trick showed leather sandwiched between plywood to hold it down, be accurate, save your fingers, and to protect your work surface. Hope this helps.

How does it do on seashells? 😆 other than that im glad it works to smooth out welds.

Hi, this item works great on seashell.

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Double Cut Carbide Rotary Burr Set - 10 Pcs 1/8" Shank, 1/4" Head Length Tungsten Steel for Woodworking,Drilling, Metal Carving, Engraving, Polishing

Product ID: 149472540

🔄Double cut for smooth, fast material removal

⚙️Tungsten Carbide durability

🛠️1/8" shank fits most rotary tools

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Description

🔧 Carve your mark with precision and power—because your craft deserves the best!

PRECISION FIT - 1/8" shank perfectly compatible with Dremel and most rotary tools for flawless centering
ORGANIZED READY - Includes sturdy plastic case for safe storage and easy transport—never lose a bit again
UNMATCHED DURABILITY - Tungsten carbide construction lasts 10x longer than HSS and 200x longer than grinding wheels
VERSATILE 10 PIECE SET - Comprehensive range for woodworking, metal carving, engraving, drilling, and polishing
EFFORTLESS MATERIAL REMOVAL - Double cut design ensures smooth, fast carving on wood, plastic, and aluminum

This 10-piece Double Cut Carbide Rotary Burr Set features tungsten carbide bits with a 1/8" shank and 1/4" cutting diameter, designed for superior durability and precision. Its double cut grooves optimize performance on low-density materials like wood, plastic, and aluminum. Compatible with most rotary tools, it offers a 10x longer lifespan than high-speed steel alternatives, making it the ultimate choice for professional-grade woodworking, metal carving, engraving, drilling, and polishing.

Specifications

ASIN	B07S8WRYH4
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#22,752 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #37 in Cutting Burrs
Customer Reviews	4.4 4.4 out of 5 stars (7,150)
Date First Available	May 28, 2019
Item Package Quantity	1
Item Weight	2.46 ounces
Item model number	ML0020
Manufacturer	Lukcase
Material	plastic
Measurement System	Inch
Package Dimensions	4.72 x 4.21 x 0.63 inches
Part Number	ML0020
Pattern	Double Cut
Shape	Wheel

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