... wheels can be made with different material, bond type, with different hardness and stracture.The ... to detailed request. The bond type can be : Resin bond, vitrified/ ceramic bond, rubber bond,Polyvinyl Acetate ,etc..Grit ... size: 24-3000#,Hardness: a-zUsage: Cutting , grinding , sanding, slot, sharpening, grooving, polishing ...