Size: Chrome steel Metric Size: 0.4mm - 100mm Inch Size: 1/64 4 Hardness: 60HRC - 66HRC Grade: G5 G10 G16 G20 G24 G28 G40 G60 Surface: Electroplating, Painting, Polishing Etc applications: Bearing, Slide Rail, Casters and Other Hardware Industrial Parts and Requirements of Hardness and Precision of Products features: High Accuracy, High Hardness, Low Price and Can Be Magnetic, Etc