3M ROLOC HARD BACKUP PAD ASSEMBLY - Backup pad designed to support 3M Roloc 2 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. Assembly also includes a Roloc shank and adaptor. Sold by the kit. 10 kits per case.