3M Stikit coated 216U PSA disc roll uses aluminum oxide as the abrasive material and has a diameter of 5 in. 3M incorporates this aluminum oxide material into the PSA disc roll forming a grit of P80. 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 PSA disc roll can be run at a maximum speed of 12000.Specification. Product Form - Disc Roll. Abrasive Type - Coated. Disc Diameter - 5 in.. Abrasive Material - Aluminum Oxide. Grit - P80. Maximum RPM - 12000. Backing Material - Paper. Color - Yellow. Package Quantity - 10 rolls per case