3M Green Corps Roloc Disc, 3 in, Grade 36 Grade 36 Heavy Duty Cloth Backed Abrasive Disc for Paint and Metal Grinding Applications Used for hard to reach areas to remove paint and/or rust and grind welds and metal 3M Roloc Attachment system for easy 1/4 turn quick change of grinding discs. Fits any standard 1/4 in drill or air tool Ideal for Body Work