AUSTOR 24 Pieces Mounted Points Abrasive Stone Heads Set 2 Shaped and 6 Sizes Grinding Wheel Bits with Free Box for Dremel Rotary Tool - 1/8 Inch Shank

Nice.

I bought these to deburr aluminum using a Dremel tool. The shanks fit my Dremel tool perfectly, but they did not work well at all on aluminum. As shown in the pictures, the stones clogged with aluminum and quickly lost the ability to cut. Maybe these are good for other materials, but they are useless on aluminum. You will notice in the second picture that half of the stone is clogged with aluminum, and half of the stone is not. This is because the stone is out of round and only half of the stone contacts the metal when grinding.

I bought them to grind the burrs and casting marks off a cast iron bench. Thought they'd be junk, but they are TOUGH!

Good price

DON'T rate a product down because of your ignorance; it is not the responsibility of the Vendor to teach you Metallurgy.These are normal abrasive stone bits.They are used for hard materials (mostly steel, iron or bronze.)If you want to grind Aluminum or Brass, you need to use a "Mizzy" (or "Heatless", or occasionally "Self-destructive") wheel or bit.They remove material from the Wheel to prevent the clogging that occurs with all soft metals.If you need to use these type of bits, you can Dress these sort of bits with a "Abrasive Dressing stone" or "Cleaning stone" to remove the affected areas (Amazon has dozens.)

11 of 24 were okay, they were straight to shank, but 13 of grind stones were attached with tilted angle. It may okay for rough grinding, but not good for precise works. Give two stars for 11 of good pieces.

Within a few minutes these bits came apart. Do not hold off well at all. On the positive, you get several in the kit so you can get a small job done. The problem then lies with having to exchange the bit often.

The problem is that the weight is not centered on the spindle and as a result you get vibration and noise when used at speed in the Dremel tool. Just poor quality.