3.969mm Carbon Steel Ball G28/G40/G60/G100/G200/G500/G1000 Liangshan Keda Steel Ball & Bearing Co., Ltd Base Info Description Pre：4.72mm/4.74mm/4.76mm/4.78mm G100 Carbon Steel Ball for Bearing Next：4mm Carbon Steel Ball G28/G40/G60/G100/G200/G500/G1000
