Silicon carbide = green - grey, C Type 1, straight, for various bench grinders. Tool grinding machines and other stationary grinders. Field of Application: For grey cast iron, hard and malleable iron, autogenous welding seams, for all metals, carbides, aluminium, porcelain, glass, and natural and synthetic stone etc. Advice: Plastic adapter sleeves for reducing 32 to 25, 32 to 20, 32 to 18, 32 to 16 are included in all sanding disc packs.