Easy to mount on the wheel with bat-pins, either 9” or 10” pin spacing, and switching bats to change grit is simple. At fastest wheel speed, and a copious amount of water to eliminate clogging of the diamond grits, these grinder bats truly do a wonderful job of flattening a bottom, rounding bottom edges, or cutting away glaze drips. Cleanup is easy with water and a stiff bristle brush. I am so impressed with their function !!! Thank you Diamond Core for having these 👍