The 3M Hookit Foam Backing Clean Sanding Disc Pad Kit 20427 provides the ultimate versatility and efficiency to make sanding a breeze. As an easy-changing sanding disc pad, the Hookit attachment system is ideal for work environments where adhesive-backed discs can become contaminated by dust and debris. The Clean Sanding Disc Pad Kit comes with adapters that range from 1/4-20 x 5.16-24 external threads, 1/4-20 internal threads x 5/16-24 external threads, 1/4-28 external threads x 5/16-24 external threads, 5/16-24 x 5/16-24 external threads, or 6 mm x 1.0 external threads. The clean sand tool adapter allows for use with a variety of tools and applications. The firm foam design helps produce consistent, reliable results, and the multi-hole pattern helps extract dust for easy maintenance of a clean and safe workspace. With the 3M Hookit Foam Backing Clean Sanding Disc Pad Kit 20427, sanding jobs are clean and easy.