... 2. sharp fast grinding 3. soft bond for hard material 4. coorespondent formulaes for exact stone Usage:1. For stones, such ... angles. Other sizes and types as below:- Size(inch)3, 4, 5, 6, 7, 8, 9TypeSingle Row, Double Row, Turbo Row ... ,#60,#80,#100,#120,#180,#200,#220 body: metal, eluminum; with or without holes Different turbo as below:-