Swivel double coupler for securing 35 mm tubes. The aluminum coupler has a black finish and accepts tube diameters from 33 to 35 mm. It supports a maximum working load limit of 250 kg under a fourfold safety factor and a maximum BGV C1 load of 125 kg under an eightfold safety factor. The coupler measures 13 cm in length, 3 cm in width, and 6.5 cm in depth, with a weight of 0.21 kg.