Material: 10B21 #. Features: large output, mature process, environmental protection color zinc, cost-effective, product consistency is good, suitable for automatic production, quenching treatment is more durable, will not occur because of hydrogen embrittle screw fracture phenomenon, salt spray test 144H, durable. Support technology: cold heading, wire rolling, heat treatment, environmental color zinc. Minimum order quantity: 10000 PCS. Supply capacity: 2000000 PCS/month.