Steel grit can be divided into GP GL GH three kinds according to different hardness. GH is the highest hardness, but the cleaning speed is the fastest, GP is the lowest hardness, but the most difficult to break, and the service life is the highest. GL is a cross between GP and GH.
How to judge the series of steel grit through the use of steel grit, steel grit corners will be passivated in use, gradually into ellipsoid shape, the passivation is more serious GP steel grit, the passivation is generally serious GL steel grit, GH steel grit always maintain the edges in use.