𝐋𝐮𝐨 𝐤𝐞 8 Pcs Rotary Grinding Stone - 1/4'' Hex Shank Assorted Shape Abrasive Stone Mounted Grinding Point Aluminum Oxide Sharpening Bits for Rotary Tool Drill

They work great hot making holes a little bigger

These worked extremely well for my little project. I needed to grind a hole in a piece of elk horn for decorative purposes. It took a little pressure to get the job done, but it worked perfectly.

work well

These are the best bits I've found (better than the ones I'd been getting from Home Depot).

Construction is sturdy and there are a nice variety of shapes.

Value for money:Value for money.

1/4" shank was too long on many of the bits. I had to grind at least 1/8" off the ends for them to fit my speed chuck. It's a good thing I have a grinding wheel to do it or I would have returned them.

I like it fitting my drill. Dremel, I don't know.