Disc Backup Pad, Disc Diameter 4 in, Face Mounting Type TR, Back Mounting Type Threaded Arbor Hole, Back Mounting Size 3/8 In. -24, Max. RPM 15, 000 RPM, Density Hard, Vacuum Hole Design 8 Hole, Body Material Rubber, Package Quantity 5. This item has been restricted from sale in the following state (s): []