The Scotch-Brite™ Match and Finish Combi Flap Brush combines the cutting action of other 3M™ Coated Abrasives with the finishing action of Scotch-Brite™ Material to allow metal finishing and blending all in one step. Featuring an aluminum oxide mineral abrasive with non-woven, open web technology, this brush helps restore final finishes on fabricated metals like stainless steel, aluminum, and brass. The mineral abrasive cuts fast while the open web responds to surface irregularities while maintaining part geometry.The Scotch-Brite Match and Finish Combi Flap Brush may be used on the 3M 1HP Match & Finish Sander (sold separately) and is available in 4-way keyway attachments for easy thread on/off attachment. This system speeds swapping out of discs, especially when different sizes or grades are required for a sequence. Under normal use (abiding by recommended RPM), the Scotch-Brite Match and Finish Combi Flap Brush minimizes chatter risk. As the brush spins, flaps rotate centrifugally and make continuous contact with the workpiece. By lapping the surface, the flaps eliminate the residual traces or marks that tend to be left by singular discs or discs ganged on a shaft.