3M Hookit Film Disc 375L, Aluminum Oxide, 5" Diameter, P150 Grade  (Pack of 50) Premium aluminum oxide abrasive offers a fast cut and long life, and performs well on many surfaces Hookit disc is easy to change and reuse, maximizing utility for the life of the disc Durable film backing is tear-resistant and provides a uniform, consistent finish Open coat construction provides an aggressive cut Load-resistant coating helps prevent dust and debris from clogging the disc