Internal buckle screw type: Pull to a specified distance to lock the inner and outer tubes eccentrically, and then rotate the screws of the inner tube to make it tight.
Spring type: The spring is fixed on the inner tube through the stamping process, so that the distance it is pulled out is longer than the required distance, and then the inner tube is pressed into the outer tube to withstand it.
If you want to buy a straight rod, it is best to buy a telescopic rod, which is a spring rod, which is more convenient to install and easy to do by yourself. And you can take it down and adjust it if you want to change the position someday.
There are many supermarkets, and now there are many on Taobao. The quality is different. If you buy online, you need to read more reviews, but you must not buy too cheap.
There are many materials for the telescopic shower curtain rod. The most common ones are stainless steel, low-carbon steel pipe paint or electroplating treatment, and PE. These materials have their own characteristics. Stainless steel is the most durable and the most expensive. The price of electroplating and PE It's relatively cheap. If you don't plan to use it for a long time, for example, if you want to use it for more than 10 years, you can definitely buy electroplating or PE, which is cost-effective.
If you want to buy stainless steel, you have to buy expensive ones. The low-priced ones are generally very thin and the material is very poor.
There is no difference in the aluminum alloy material model, but the thickness is different, and the price will be much different.
There is not much difference between plastic spraying, electroplating, and plastic coating of iron pipes. The price is relatively moderate, and there is not much difference in fraud. It is only the difference in pipe diameter. The commonly used pipe is 22/25 pipes, and the price is as low as 13/16 pipes and 16 pipes. /19 tube.