Special Line SGP includes products engineered for specific tasks that offer the user key advantages over conventional products. This quality line also includes products that, due to their particularly high performance, offer ultimate economic efficiency. The patented flap disc POLIFAN-CURVE has been specially developed for work on fillet welds. It is the only flap disc in the world featuring a radial configuration of flaps allowing for grinding with all surfaces of the disc. Special flap disc for work on fillet welds on aluminum.