Firepower flap discs durability over the conventional fibre disc results in reduction of both labor and material costs. Designed to wear away evenly and present a constantly fresh work surface. No backing pad required - comes with fiberglass backing plate with higher RPM rating than resin fiber discs. No loading up, as new sharp abrasive particles are constantly exposed. Maximum RPM: 13,300 Cut and finish at the same time with consistent finish - for coarse and intermediate grinding and machining of welds, deburring, rust removal, snagging, removal of paint, etc. This means fewer change-overs. Suitable for almost all materials: ferrous and non-ferrous metals, wood, leather, glass, marble and plastics.