Problems that should be paid attention to in purchasing cable tray

Nowadays, the Internet is so developed and the e-commerce industry is booming. I believe it is needless to say that online shopping brings benefits and convenience. Nowadays, there are all kinds of quotation tables for Cable Tray Manufacturing Supplier on the network, no matter how low or cheap they are. Many friends wonder why aluminum alloy bridges on the Internet are so cheap. 
Today, Tianan Bridge is here to talk about this problem: the price calculation method of our aluminum alloy bridge manufacturers: basic raw material price (ton) + manual processing fee + equipment depreciation fee + tax + management cost + anticorrosion treatment fee = finished product price (due to some regional problems, freight is calculated separately) the price of raw materials is adjusted according to the changes in national iron and steel prices, and the price needs to be adjusted several times a day during peak periods. 
In addition, the specifications and models of aluminum alloy bridge add up to thousands of types, all of which are customized according to the size of aluminum alloy bridge used in the construction site. Thousands of specifications, coupled with changes in the price of raw materials, do not wait for you to update the price online, the price has changed again, so the price of aluminum alloy bridge seen on the Internet is fluctuating. 
Whether it is online shops or agents, they take the supply point or our manufacturers, so it is good to suggest that we should dock directly with our Cable Tray Manufacturing Supplier manufacturers. 
Why the online bridge is so cheap: first, the merchants just lower the price to attract you to buy, and then come back to tell you about the price change when you buy. 
Second, the price is fixed. When delivering goods, the merchant only gives the cheaper aluminum alloy bridge, which is not what you want in your heart. When you want a refund, you will find that you have to pay high logistics fees, because the bridge is different from those fast consumer goods.