Standard:
ISO,ISO,GB,DIN,JIS,
Material:
Stainless steel, carbon steel,brass, aluminum,
Certificate:
ISO 9001:2015 and ISO 14001:2015
Surface treatment:
Plain,oxide,zinc plating,black,yellow zinc
Head Style:
csk head,hex head,pan head,flat head,wa
Grade:
4.8 6.8 8.8 10.9 12.9