It is made of chrome vanadium steel and is forged and pressed by heat-treated steel, which is not only wear-resistant but also has high hardness and a long service life. The product is easy to use; simply place it on the filter, and then rotate it in the same direction to automatically shrink it. There is no need to manually adjust the size. The concave cutting teeth can improve grip. It can be easily renovated if necessary. The chain length can also be adjusted. It is lightweight and small in size. It is easy to store and use. The product has a wide range of applications. It is very suitable for disassembling and removing oil filters on automobiles and machinery.