3Mâ„¢ Hookitâ„¢ Paper Disc 236U offers aggressive cut and long life on a premium aluminum oxide disc with a durable edge and convenient Hookitâ„¢ attachment. A go-to product in many industrial operations, this durable disc is well suited for high production sanding operations as well as general purpose applications on paint, primer, wood, metal, plastic, and composites, including fiberglass.