Silicon Carbide Velcro Sanding Disc (velcro or PSA): to grinding, polishing for ... steel, metal and mold,etc... Product Description:velcro abrasive disc Silicon Carbide Velcro Sanding Disc (velcro or PSA) be fixed on electrical ... mold, and so on. Bond: Resin over resin Coated material: Silicon carbide Dimension ( diameter): 4"(100mm), 4.5(115mm), 5" (150mm), 6 ...