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Made from durable steel material for heavy-duty and longer use Has high rust and corrosion resistance 6 sides that gives a good granularity of angles for a tool to approach from Used together with bolts and washers to play a tightening role in operation Can be used for all kinds of daily fastener work such as machines, machine tools, tables, cabinets, bicycles, etc. The force is even, the installation is simple and quick, and it is not easy to fall off
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