3M Roloc discs provide a fast, efficient method for grinding, 3m roloc disc button color/grade chart blending, leveling and finishing on all types of metal. They lock securely in place with just a half twist, another half twist and they're off. Each disc is color coded by grade. Great everyday value. Aluminum oxide 3m roloc cloth discs constructed on a durable polyester backing for coarse grinding. Resin bonded for heat resistance. General purpose grinding, light grinding, blending, and deburring on all metals. Attachment type: TP. Coat type: closed coat. Converted form: roloc disc. Equipment - machines: disc sanders. Form type: roloc. Position: good.