low carbon steel ball 1.size : 0.5mm to 60mm 2.Grade : G100, G200, ... Available:G100, G200, G500, G1000, G2000Application: Moderate loads and allow rotating parts, for example: castors, conveyors, roller skates, drawer slides, seat ... .CertificationISO 9002: 2000OriginalShandong province , China AISI 1020 LOW CARBON STEEL BALL (0.5MM-100MM)