... ,SAE 4.Durability 3000times 5.Hardness,41-63HRC Cast Steel Grit1. Steel grit : G10/G12/G14/G16/G18/G25/G40/G50 ... 25G-40Cutting/grinding stone; Blasting rubber adhered work pieces;Descaling steel plate, container, ship hall before painting; Cleaning small-to ... iron, forged pieces, etc.G-50G-80G-120Blasting/descaling steel wire, spanner, steel pipe before painting process; Cleaning precision castings (eg. ...