Oh nooooo! I've lost the number! Been back to J&L Industrial Supply. It is some sort of Scotchbrite Wheel 6" x 1/2" with a 1/2" hole in the middle. I used three at a time with the standard mandrels I had. All I can find is really expensive stuff now. I'll let you know when I find it again. Did find something else, though, 1" x 30" Scotchbrite belts for my Commie Sander. Hmmmmm.