... 6-8times of press steel 4.soft, mid-hard and hard bond separatly Usages:1. For stones such ... as granite, marble, natural and artificial stones, etc.2. For fast rough dry or ... water-cooling grinding, leveling, shaping and polishing stone surface, corners,edges and angles. Other sizes and types as below:- Size(inch ... color available More pictues of double row cup wheel as below:-