http://www.hualongfasteners.com/heavy-hex-bolts/
Hualong fasteners stock special offer wholesale sales of various materials, coatings, standards and specifications of high strength bolts in the six corners (direct manufacturers). The inner hex angle bolt is opposite to the outer hex angle bolt, and the middle part of the bolt head is a concave hexagon. Inside the hex angle bolts need special tools for disassembly, of course, you can also use hex agonal steel bar to make a demolition tool (bending to 90 degrees can).
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