Oregon3/16Inch Unthreaded Chain Saw Sharpening Stones 3Pack 31396

Not terribly effective, but my rotary tool is a little underpowered! Therefore I gave them 4 stars for the benefit of the doubt.

Works well

I like these more than the usual Dremel stones. They work perfectly and I feel the media is better, which means a quicker sharpening. There are some other products - advertised as diamond-containing, but I found the quality lacking in the machining - the shafts were not straight. So to me, these are a better value since they appear to be of excellent quality. Very happy with these.

First one last about a quarter of the way the other one broke soon as I started it’s like they were brittle

Couldn't find these locally, so online works.