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Roloc, 7000045100, Abrasive Disc, Type Tr Attachment, 3 In Diameter Disc, Aluminum Oxide Abrasive, 80 Grit, Medium Grade, Polyester Backing, Yf-Weight Backing Weight, 20000 Rpm Maximum, Yellow. 3M 361F Roloc Quick Change Discs Are For General Purpose Grinding, Blending And Finishing On All Metals. Due To Its Fast Cut-Rate, Hardness, And Strength, It Is Widely Used In Grinding Applications In Addition To Sanding And Finishing Applications.