... . Materials10B21, SCM435, 45# steel, S25C, S20C, or any other as per your need.4.Surface treatmentblack oxide, zinc plating(white, yellow, black colour ... , 48 hours, 96 hours, 1000 hours we can do as per need. And can offer with salt spray checking report.6.Special ... provided as per your need.We can supply you with full kinds of fasteners, and we can also produce it according to your requirement. As a ...