Tianjin longlong metal products factory (hereinafter referred to as longlong) was founded in 1991, since it is establishment, Longlong has been engaged in manufacturing and R&D for vaious of cold bending steel profiles, flat uniaxial tracking bracket system, photovoltaic bracket, greenhouse steel structure and parts, as well as equipment production for products mentioned above; All the products have features of high precision, superior high standard, high performance due to dedicated professional experience.