Features and Benefits: * Backup pad designed to support 3M Roloc 3 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 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 * Maximum operating speed: 20,000 This assembly also provides support for the 3M Roloc Bristle discs.