Foredom 1/2″ X 1/2″ Aluminum Oxide Sanding Bands - QTY 200 Various Grits 200-Packs of Aluminum Oxide Bands available in 60, 80, 120, 180, 240, 320 or 600 grit. Use with mandrels 40,000 RPM Max Speed. Aluminum Oxide Abrasives are made of high-grade mineral and a bonding system that reduces shelling of the mineral. These economical abrasives are excellent for fast clean-up and pre-polishing work. Use the Sanding Bands with 3/32″ (2.35mm) and 1/8″ shank rubber drum mandrels. To install, slip band onto rubber drum with screw loose. When band is in position, tighten the screw, which expands the rubber drum, for a secure hold. *Optimum Operating Speeds are much lower (between 25% – 50% of maximum speeds) and also depend on the type of workpiece.