5.4mm 0.210inch Chrome Steel Material and G10-G1000 Percision Steel Ball for Belt and Roller Conveyors 0.642g Shandong Jinnai International Trade Co., Ltd. Base Info Description Pre:4.49mm Size and AISI 52100 Material G100 High Precision Carbon Steel Balls for Tumble Finishing 0.369g Next:5.45mm Large Stock and Cheap Price Carbon Steel Ball Bearing Steel Balls AISI1010-1015