It is used for disassembly maintenance of the spindle. Until now I have been using the other company's products, but the pins are easy to break, so it is impossible to replace them, the strength of the main body is weak, etc. There was not anything that could endure use at the moment. Although this product looked weak to the appearance in the photograph, when it actually touches it it is considerably solid and it is robust. It is thought that it can be used for a long time as it is also possible to replace the pin because it is difficult to break. The method of adjusting the opening with screws is very easy to use in terms of operation feel and also from repeated use. Since the pin diameter is from 5 mm, I would like a lineup that can accommodate 3 mm and 4 mm, and I really want to buy it once it is actually released.