Profile wheels are made professionally . Dry or wet application. Profile wheels 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 #200 Thread size : 5/8-11, M14