This assembly also provides support for the 3M™ Roloc™ Bristle discs.
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