... /304/304HC/316/316L/420/440Size30 - 300mmThicknes0.5mm- 2mmHardness 22-65 HRCApplicationscraftwork, valve, architecture ,all kinds of machines , hadware , bearing , ectPackingMedal ... -1.2016.00-18.001.00max1.00max0.040max0.030 max58-65 China made good quality and high precision float ball ( SGS approved )