1.Ervin test machine 2.national standards 3.long service life 1. Description ... shots produces fast cleaning speeds at reduced costs.2.Grade: S10,S20,S30,S40,S50,S60,S100,S150,S200, ... S300. Size: 0.1-0.2mm, 0.1-0.3mm, 0.2 ... 1.0-1.4mm,1.25-1.7mm,1.4-2.0mm,1.7-3.0mm. 3. Appearance: round ... : Namestainless steel shotChemical Composition%C≤0.20%Mn≤2.00%Si≤4.00%S≤0.03%P≤0 ...