3 to 4 centimeters. Yingkou Tuotian Company is a comprehensive enterprise integrating R&D, complete production and sales of aluminum alloy profiles, with the ability to independently produce hot extrusion dies, powder coatings, heat insulation strips and packaging materials. The parameters of 70 series broken bridge aluminum are 3 to 4 cm. Tuotian Aluminum has good quality and high cost performance among similar products.