Features. 3 Pack.. Size - 4.5 in.. 80 Grit.. Resin Fibre.. Aluminum Oxide Steel Sanding Disc With 78 in. Arbor.. Ideal For Weld Grinding Blending Finishing Deburring Other General Purpose Applications.. Can Be Used On Most Types Of Steel As Well As Fiberglass Plastics.. Constructed With A Heavy Vulcanized Fibre Back.. Coated With Abrasive Grains.. Bonded Together With A Tough Heat Resistant Resin For Fast Cutting Action Long Life.. For Use On Right Angle Grinders.. Dimension - 0.15 L x 6 W x 5 H in.. Item Weight - 0.25 lbs.