4mm Carbon Steel Ball G28/G40/G60/G100/G200/G500/G1000 Liangshan Keda Steel Ball & Bearing Co., Ltd Base Info Description Pre：3.969mm Carbon Steel Ball G28/G40/G60/G100/G200/G500/G1000 Next：4.78mm AISI 1010 Carbon Steel Ball G28/G40/G60/G100/G200/G500/G1000
