Detailed Product Description Profile wheels with vaccum brazed technology are made professionally . Dry or wet application.Grinding on marble, granite , limestone and concrete.Specification :A20, A30, A40, B20, B30, B40, F20, F30, F40, V20, V30, V40 ,Grits :#30 #50 #100 #200Thread size : 5/8-11, M14