... have a long history bule cover truss,roof truss,aluminum truss Material size details: 150*150mm,200 * ... 400mm etc.screw to connect the standard aluminum alloyFrame :4,3,2Type: 4,3,2.Material ... : Aluminum 606,160,636,082Head (diameter * thickness): 50 * ... , arc frame Color: Optional.Connection: screw or boltCanopy:sun canopy ,rain canopy. no canopyCertification:CE, TUV, ISO9001 ...