There are special high-strength bolts on the steel structure, and the head will be made larger and the size will be varied.
Bolt and Nuts Description

FAQ
Q: Are you a trade company or manufacturer?
A:We are a professional manufacturer with our own factory.
Q: Can you arrange the shipment?
A: Sure, we have permanent freight forwarder who can gain the best price from most ship company and offer professional service.
Q:Can we get the some samples?Any charges?
A:Yes,you can get available samples in our stock.Free for real samples,but customers need to pay the freight cost.
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