The 3M Hookit Low Profile Abrasive Disc Back-up Pad is designed specifically for better leveling and faster material removal during flat auto body sanding. Its low profile and medium density foam construction afford excellent control, and its 15-degree blunt tapered edge holds up under tough conditions. Specially designed for use with 3M Hookit Abrasive Discs for fast change-outs.Use 3M Hookit Low Profile Abrasive Disc Back-up Pad for flat sanding with more control and longer pad life and with applications requiring coarse grades. The low profile design is ideal for leveling and for faster removal of material from the work surface. Its durable, medium density foam construction adds conformability for longer disc life and gives the operator a good feel for the surface even during aggressive sanding. The 15-degree blunt tapered edge adds durability. Its 5/16-24 exterior threads fit a variety of power tools.