Rotary Burr Set Carving Tool Tungsten Carbide Steel Solid Twist Drill Bit Grinding Head for Dremel Rotary Tools Woodworking Engraving Drilling (10pcs)

I bought them to use on knives I make after I've hardened them. At the price I figured even one knife would be work trying them out. So far I have reground all the serrations very quickly and satisfactorily. The bits didn't even seem to care that the knife was already hardened, they chewed right through without signs of wear. I also used them to clean up some decorative file work I did on the spine and they worked great. If they wear out after more abuse they've still been worth the cost. For a point of reference the knife is made of 1084 and 15N20 and hasn't been tempered. Update: 9Aug2020 still chewing up metal with these. Being that they cut the metal rather than grind like sand paper be prepared for tiny metal slivers. They are a great buy.

These burrs worked great for a small woodworking project I was doing with oak. Great for taking away material. Chewed through the wood fairly cleanly with my Dremel and didn't have to hit the wood with too much sanding afterward. It might not be the best if you're doing intricate work on some really small projects, but overall I'm impressed and works as advertised. The burrs stayed sharp after a few hours or so of use. With how easily they removed material, I would buy again if these ever dull.

I only had one job so far for these bits, and the ones that I used did just that. Can't complain about anything.

If you want to absolutely shred metal pieces with ease, use these bits. They can cut through practically anything. I've cut wood, high grade STAINLESS STEEL (I have had other bits that couldn't even look at this same steel), Aluminum, etc. without any problem. Best bang for your buck, I guarantee it.

Currently doing a carving using Oak. This is a very hard wood to carve, The Tungsten Carbide bits worked better than expected cutting away the waste wood quickly and smoothly.

I've cut plastic, aluminum, iron, and steel with these, and I've yet to see any signs of wear. Very good cutting tools, and a very nice price.

The shafts are smaller than the standard Dremel "bits". I haven't yet tried to use a different collet to see if the "bits" will tighten. They certainly don't with the 1/8" collet.

The tips are certainly just a touch bigger than I expected, but they seem to be quality. The grooves in each tip are fine and look durable. I’ve had no issues yet after a week of use, but I am enjoying them so far. Quite sharp as well!