Flap grinding discs in nylon strengthed flat pad for diffilcult applications. Bilamellar execution with zirconium cooling admixture. It garantees self lubricated cold machining. The pair of grinding discs are of superior width than normal which offers an increase of the abrasive surface and an increase of the life of the discs. For correct use it is adviced to use suitable power sanders, suited for steel, high alloy steel, stainless steel also cast iron, aluminum and light alloys