| 出生地 |
Zhejiang China (Mainland) |
| 类型 |
活塞戒指 |
Material for our rings : ductile cast iron , alloy cast iron , high alloy cast iron , heat-resistant stainless steel , alloy spring steel , superior carbon steel . Surface treatment we have : Chromium , Gas Nitriding , Copper Plating , Tin Plating , Phosphating , Moly Inlaid , Sand InLaid