Stainless Steel Ball Size: 0.3mm~25mmGrade: G10~G1000Hardness: HRC 58-65Material: 201, 202, 302, 303, 304, 316, 316L, 420, 440, 440C and so on. Standard: GB, ASTM, DIN, JISUse in the industry of hardware, bearing, guide sleeves, guide rails, grinding materials, micro mists, polishing, decoration, toys, military industry, automobiles, motorcycles, bicycles, household appliances, chemical machinery, textile machinery, food machinery, mining machinery and so on.