Scotch-Brite™ SR Radial Bristle Disc includes 40 discs and comes with Roloc™ attachment accessories, including plastic Roloc™ buttons and holders Discs can be attached to a straight grinder or right angle grinder using a 3M #990 or #991 mandrels (sold separately) Plastic abrasive particles and unique bristle design lightly remove sealant without compromising integrity of the part