YAHUA TOOLS FACTORY is the professional manufacturer of the scaffolding accessories, including fixed couplers, swivel couplers, clamps, connecting, etc.. our couplers are in compliance with EN74(BS1139), accepted smoothly by U.S and Europe customers. Now, according to our monthly production ability, we can supply you at least 5x20"-container every month based on our present couplers if you demand.At present, we can reach following 3 points: 1, comparably low price, we have low labor and strict management; 2, timely delivery, we can provide our customer 5x20"-container products in 30 days, and the factory is close to Shanghai city, convenient to transport;3,quality, we still stick to the good quality under strict administration.