宁波市镇海区贵驷朝阳五金螺钉厂
Ningbo Zhenhai Guisi Zhaoyang Hardware Screw Factory
宁波市镇海区贵驷朝阳五金螺钉厂
DIN 931 (DIN 931-1 - 1987)
grade, rigidity Grade 8.8 (HRC22~34)
Coating hot dip galvanizing