3M Scotch Brite Maroon 5 Inch Disc is used with a random orbital sander to scuff marine and automotive finishes. This 5 inch disc is also used as a last step on solid surfaces to achieve a matte finish. Machine scuffing with these medium duty conditioning discs is a quicker, more efficient method than the traditional hand method. Hookit backing mates with a 5 inch hook and loop backing pad such as the 3M 77855.