... within the scope of 1.17m to 4.39m at will, the short spine is used in balcony ... ,and the weight in the same area is 100-150kg at most, so the supporting strength is enough for ... No.2 : the various type beam can be regulateed at your will No.3: the smart lock connection between ... Now , the template supporting structure used for concrete at construction site has adopted the structure way of steel and ...