Description PRODUCT DESCRIPTION Backup pad designed to support 3M Roloc 3 inch diameter abrasive discs. This pad has a 1/4-20 INT thread which allows it to be mounted directly to tools with 1/4-20 EXT threaded shafts or use with Roloc shank to fit collet chuck tools. Hard Density Rating 20,000 Max RPM Disc attachment is quick and easy, increasing productivity Versatile system works with drills, disc sanders, right angle grinders, and rotary sanders Brand: 3M Product Code: 3M60440237778 SKU: 60440237778