Abrasive flap disc has successfully taken place of the grinding disc in many areas of surface finishing. The perfermance of the flap disc with its fan-shaped radial arrangement of cloth grinding flaps ,far exceeds that of other abrasive products. Welldon flap disc are made of zirconia alumina, ceramic or lauminium oxide. Zirconia alumina grit , self-sharpening is good, cotton backing,espacially for cool grinding on stainless steel.