... 2. sharp fast grinding 3. soft bond for hard material 4. coorespondent formulaes for exact stone Usage:1. For stones, such ... ,edges and angles. Other sizes and types as below:- Size(inch)3, 4, 5, 6, 7, 8, 9TypeSingle Row, Double Row, Turbo ... body: metal, eluminum; with or without holesDifferent turbo as below:- 4 inch double turbo diamond cup grinder with aluminum body in 22 ...