3M™ Fibre Disc 581C Blue. The 3M™ Roloc™ 977F Cloth Disc contains a 3M high-performance ceramic abrasive grain on a laminate YF-weight polyester cloth backing. It offers a continuous cutting action and durability which can boost productivity. The Roloc™ attachment system saves time and is easy to manage as it locks the disc in place with a short twist. Suitable for a variety of general purpose metalworking applications from weld removal, deburring and blending. Outstanding Cutting Performance. The 977F disc contains an impressive ceramic abrasive blend gives a good performance on mild and stainless steels. The blend offers a continuous cutting action and coupled with reinforced edges, which adds durability where edge work is needed. The heavyweight backing supports wet and dry applications. The 977F discs abrasives allow for reducing grinding temperatures for processes involving heat-sensitive alloys. Features and Benefits. Stiff fibre backing and strong resin bond provide durability and tear resistance during heavyweight applications. Alumina-zirconia abrasive on a fibre backing that ‘s closed-coated and resin bonded. Ideal for grinding and finishing weld seams on all metals. Buy disc pad face plates and fibre discs separately. Typical Applications. These heavy-duty fibre discs are great for weld removals, grinding and blending large and small metal areas. This could occur in industries such as farm and construction, automotive, ship and boat building, metal fabrication. FAQ's. Would you be able to use these discs on wood . No, these are not recommended to be used on wood, just the metals