It is a knuckle joint in showcase system. It can be used to connect three pcs of S1105B vertically, but with one thread M10 for S745, S746. The feet of the joint are 42mm. This joint is used when putting together a table or cabinet. It weighs 0.227kg per each. Screws are used when the knuckle joint is to be fixed to the extrusions. It is simple to assemble, easy to disassemble and it is robust and durable. It is made of zinc. The products of LingTong are green and environmentally friendly. If there are some relative needs, LingTong will provide the best service for you in exhibition construction.