CGW Ceramic blend Resin Fiber Discs are ideal for blending welds, deburring and edge cleanup of very hard and tough metals. Ceramic grain is extremely hard, continuously self-sharpens during operation and will give the fastest cut rate and longest working life on hard and tough metals when compared to AO and ZA abrasive discs. CGW Ceramic Resin Fiber Discs are manufactured with a special grinding aid to keep the disc cool while grinding hard metals, stainless steel, nickel based alloys and aluminum.