3M Bristle Disc Mandrel is a tool attachment that holds a small abrasive bristle disc (sold separately). Together, the mandrel and disc enable the user to clean, blend, or finish hard-to-reach areas of a work piece, such as inside corners, complex angles and curves. The mandrel attaches to a rotary tool such as a die grinder or drill.

The 3M™ Bristle Disc Mandrel 27680 is used on a bristle disc that is 1" or smaller in diameter with a 1/16" center hole, for attachment to a 3/32" drill or collet chuck. The two-piece mandrel has a bolt that is inserted through the center hole of the bristle disc and then tightened into a threaded spindle. The spindle can then be inserted in a 3/32" collet chuck or drill. Max RPM is 30,000.
For more than a century, 3M has applied innovation and technology to improving our customers' lives and supporting their business goals. Today the company, from its headquarters in St. Paul, Minnesota, serves industrial and commercial customers and consumers in nearly 200 countries. Abrasive Systems products, including a complete line of coated abrasives, microfinishing and microreplicated abrasives, and hardware accessories, provide the finishing touch for almost any surface conditioning application. The 3M brand, across thousands of products, represents consistency, superior quality, and value.