The spring type is fixed to the inner tube through stamping technology, so that the distance it can be pulled out is longer than the required distance, and then the inner tube is forcefully pressed into the outer tube, pressing against the spar. The screw fixed type is also known as a combination rod, which can be used at corners or when only one side of the mast is in contact. It can be assembled into L-shaped or U-shaped parts through accessories and then fixed to the wall with screws.

Most domestic products are made of stainless steel, but they are expensive or cheap with thin wall thickness. In foreign countries, aluminum alloy is mostly used for high-end products, followed by spray coating, electroplating, or cladding for iron pipes. At present, alloy prices have risen significantly, and iron pipes are more commonly used. Internal screw type: Pull to the specified distance and lock the inner and outer pipes eccentrically, then rotate the screws of the inner pipe to make it support tightly.