... double row, metal body 2.good balance 3.lifespan 6-8times of press steel 4.soft, mid-hard and hard bond separatly ... 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 ... pictues of double row cup wheel as below:- diamond grinding cup wheel for marble and granite surface,corners,deges and angles