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

🔄Double cut for rapid stock removal

🔥Heat-treated tungsten carbide

⚙️8 precision-shaped burrs

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Description

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

UNIVERSAL COMPATIBILITY - Fits most rotary tools and die grinders, perfect for metalworking, woodworking, and mold making.
DOUBLE CUT EDGE TECHNOLOGY - Dual-direction flutes deliver faster material removal and smoother finishes on tough metals.
VERSATILE 8 PIECE BURR SET - Covers all your carving, grinding & polishing needs with multiple shapes for ultimate control.
PRO GRADE PRECISION CONTROL - Engineered for detailed deburring, contouring, and milling on ferrous and non-ferrous metals.
PREMIUM TUNGSTEN CARBIDE BUILD - Heat-treated for unmatched durability and long-lasting sharpness under heavy use.

The JESTUOUS Carbide Burr Set features 8 double-cut tungsten carbide burrs with a 1/4 inch shank, designed for die grinders and rotary tools. Engineered for rapid stock removal and precision shaping, this set excels in metalworking, woodworking, and mold making. Its heat-treated carbide construction ensures durability and long service life across a variety of metals including steel, aluminum, and copper.

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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$122.26

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

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