Firepower flap discs durability over the conventional fibre discs results in reduction of both labor and material cost. They are designed to wear away evenly and present a fresh working surface. Cut and finish at the same time with consistant finish- for coarse and intermediate grinding and machining of welds, deburring, rust removal, removal of paint, etc. Suitable for almost all materials which include ferrous and non-ferrous metals, wood, leather, glass, marble and plastics. No backing pad required. Disc comes with fiberglass backing plate with higher RPM rating than resin fiber discs.80 ZA 13,300 4-1/2 x 7/8 (without hub)