Made in China 16mm AISI440 420 Stainless Steel Ball Changzhou Feige Steel Ball Co., Ltd. Base Info Description Pre：25.4mm AISI 1015 Grinding Solid Carbon Steel Ball Next：Rock Bit AISI S-2 Tool Steel Balls for Mud Lubricated Bearing Assemblies/Oil Screw Drilling Bearing/Bearings for Downhole Motors
