This product is made of 10B21, cold upsetting and hardened (HRC22~32 ℃).
In order to prevent the rust of the blank material, the surface has done trivalent zinc coating, the salt spray reaches more than 96H without red rust.
Dongguan Tiansheng Co., LTD has been specialized in developing and producing non-standard fasteners for 12 years.
 

You are welcome to customize different head type/length/surface treatment and similar products by drawing/sample.