What is the maximum rpm these are rated for?

Melissa the set comes with no info whatsoever so I don't know any max rpm rating. However I've given mine a real good workout grinding welds,plate steel,cast iron,sheetmetal etc for quite some time now using both pnuematic and electric high speed die grinders which typically max out around 20,000 to 25,000 rpm. I can honestly say I've been very well satisfied with my set.I also have the 1/8" shank set for my Dremel and they work great too.. Hope this helps!

What country are these made in?

No labels on mine. But they ported cast iron heads plus cut all the spot welds on my mustang restoration and still killing it. Worth twice as much.

Will this work for making a hole bigger on a bathroom sink for the faucet? If not, recommendations?

I suppose it could. But really depends on the material of the sink, and how much larger you need to make it. It’s also going to be a bit tough to keep it perfectly round. I have used these but a lot in heavy gauge steel. But not ceramic or anything.

Could I use these for woodwork with any success?

These bits are designed for metal. They may do some work on wood, but you should get bits for wood to maximize you effort. Also, never use a metal bit on aluminum without using lots of lubrication. Otherwise you will wind up with a mess of clogged cutters. They are not self-cleaning on aluminum.

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Carbide Burr Set 8pcs 1/4 Inch Shank Diameter Double Cut Grinding Polishing Carving Tool Drill Bits for Die Grinder

Carbide Burr Set 8pcs 1/4 Inch Shank Diameter Double Cut Grinding Polishing Carving Tool Drill Bits for Die Grinder

Product ID: 64113752

Details

Cutting Diameter
0.25 Inches
Finish Type
Unfinished
Material
Carbide
Number of Flutes
16
Size
0.375; 0.5; 1

🔄Universal 1/4 inch shank fits most rotary tools

🔥Heat-treated tungsten carbide

⚙️8 precision double-cut burrs

S$102

Duties & taxes included

In stock

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Description

⚡ Elevate your craft with precision power – don’t get left behind!

BUILT TO LAST - Crafted from 100% new heat-treated tungsten carbide for unmatched durability and heat resistance.
PRO LEVEL PERFORMANCE - Ideal for metalworking, mold making, surface cleaning, and precision hole opening on ferrous materials.
PRECISION IN EVERY CUT - Double-cut design with 16 flutes ensures smooth, efficient material removal for flawless finishes.
SEAMLESS COMPATIBILITY - Standard 1/4 inch shank fits most die grinders and rotary tools, making upgrades effortless.
VERSATILE SHAPE SELECTION - Includes 8 burrs in multiple shapes (cylindrical, round, tree) to tackle carving, grinding, polishing, and engraving.

This 8-piece carbide burr set features double-cut tungsten carbide bits with a universal 1/4 inch shank, designed for professional-grade grinding, carving, and polishing. Engineered for durability and precision, it fits most rotary tools and excels in metalworking, mold making, and surface maintenance tasks.

Specifications

ASIN	B07CMSNYW1
Best Sellers Rank	#107,480 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #218 in Cutting Burrs
Brand Name	JESTUOUS
Customer Reviews	4.7 4.7 out of 5 stars (1,030)
Cut Type	Double Cut
Cutting Diameter	0.25 Inches
End Cut Type	Ball End
Finish Types	Unfinished
Manufacturer	Tungsten technology inc
Material Type	Carbide
Model	43398-54709
Number of Cutting Edges	16
Number of Flutes	16
Part Number	43398-54709
Shape	Cylindrical, Round, Tree
Size Name	0.375; 0.5; 0.25; 0.625; 0.21875; 0.3125; 1
Tolerance Held	Precision
UPC	603977806226

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