3M 5″ GREEN CORPS FIBRE GRINDING DISCS – The 3M Green Corps Fibre Disc is an all-purpose grinding disc for any kind of metal or fiberglass grinding. These high performance green grinding discs are long lasting and fast cutting for a whole new performance level in metal and fiberglass grinding. Excellent for boat propeller reconditioning. Disc is 5″ x 7/8″. Product is sold by the individual disc.