The CYCLONE S ROCKBUSTER is here to replace the silicone carbide grinding wheels. Size: 4". Fitting: 5/8″-11 thread, rubber. RPM: 5,000. Designed to be used on concrete, engineered stone, granite, marble, and ultra-compact materials. Use WET or DRY - Eliminate dust…with the ROCKBUSTER resin cup wheel! Eliminates dust and workplace hazards. NEW radius edge design replicates the most common shape for silicon carbide wheels using a dresser handle. 30/50 grit are aggressive enough for rapid stock removal with minimal effort. 100/200 grit work great for clean up on seams or miters. They also perform very well on ultra compact materials. 10 mm radius allows usage for tight sink radius work. New rubber body eliminates vibration.