3M 341D Coated Aluminum Oxide Spiral Band - 80 Grit - 1/2 in Width - 1/2 in Dia - 30000 Max RPM - 40227 [PRICE is per EVENRUN BAND]3M coated 341D spiral band uses aluminum oxide as the abrasive material and has a diameter of 1 2 in. 3M incorporates this aluminum oxide material into the spiral band forming a grit of 80. All abrasive products that rotate or spin, such as the ones in this category, have a maximum speed at which you can run them. This 3M spiral band can be run at a maximum speed of 30000. Sale Unit: EVENRUN BAND Brand: 3M Abrasive Type: Coated Band Diameter: 1 2 in