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By certification 
APPLICATION - The Bolts for Joining Wood, Boards, Kitchen Worktops, Cabinets, Cupboards and A Variety of Other DIY Projects.
PRE-INSERTED NUT - High quality nylon, adopting expansion principle for perfect locking
MATERIAL - Zinc Plated Metal,strong rust resistance, exquisite workmanship, sturdy and durable.
FEATURES - A combination of various types of furniture suitable for installation and quick disassembly, especially when the fixing effect of non-solid wood fasteners is not enough, the three-in-one eccentric cam connection assembly is ideal.
http://www.zinhardware.com/
