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hello,dear sir Our company is a professional manufacturer and supplier of scaffolding and guardrails in China. Our products include scaffolding systems ,such as cuplock,layher,plettac,ringlock,kwik-stage,frame,guardrails and accessories,couplers, formworks, barriers, walk platforms, steel planks, shoring props ,etc. All our products are manufactured by ourself.So the price is very cheap.i try to give u some ton price so that u can trust me ,and u will believe that i am a real manufcturer. We have been supplying our scaffoldings and guardrails to international market for a number of years,so please believe that we have the experience and expertise to offer you products with the best quality,price,and service. Our products have been exported to more than 60 countries in Europe,North America,South America,Southeast Asia,and Africa. I don't want to introduce anymore.The price can prove everything.So just give me a chance ,then I will give you the cheapest price. this is screw jack,very useful,and strong! normally the diametre is 32 and 38, the length is 400.500,600 superficial treatment:electro galvanized,hot dipped,painted!