| Place of Origin |
Zhejiang China (Mainland) |
Standard according to IFI-156,DIN316 Size from1/4 to 5/8",M4 to M16 Material:low carbon steel,middle carbon steel Surface:plain,black oxide,zinc plated(Cr6/Cr3),zinc plated yellow,zinc plated black,HDG,dacromet(200 to 2000 hours)