The 3M Roloc bristle disc holder is a convenient and durable backup pad for attaching and supporting Roloc bristle discs during collision repair jobs. Hard rubber construction of the pad holds the disc firmly for smoother, more consistent finishes. The assembly easily accepts 3M Roloc bristle discs and includes a Roloc shank for direct attachment to grinding tools with 1/4 in – 20 TPI EXT threads.