We have UL certificate for beam clamps by our selves. Tianjin Sun Metals Inc. is a manufacturer of various metal components. We make iron castings, non-ferrous metal castings, stampings, scaffolding clamps, various pipe hangers, strut components, and other related products. We have over 16 years' history with over 260 employees. Our factory covers an area of more than 18,000 square meters. Most of our products sell well in the USA, Europe, South America and Hong Kong. We attained the ...