3M™ Sanding Disc Pad Hubs

2-1/2" 5/8-11 Internal Disc Pad Hubs. Holds the face plate firmly in position to support a fiber disc with a 7/8" center hole, which is secured to the hub with a compatible retainer nut. Enables operators to select face plates with four different densities: Soft, Medium, Hard and Extra-Hard (plates sold separately). Manufactured by 3M.