... . sharp fast grinding 3. soft bond for hard material 4. coorespondent formulaes for exact stone Usage:1. For stones, such as granite, marble ... , natural and artificial stones, etc.2. For grinding, leveling, shaping and polishing stone surface, corners,edges and ... )3, 4, 5, 6, 7, 8, 9TypeSingle Row, Double Row, Turbo Row, Radial, SnailConnection22.23mm, 5/8inch -11, M14, M16 etc ...