1.High quality: due to the different diameters on the front of the pressure piece (52, 55, 46.9, 44, 41, 34), it can adjust different sizes of bearings and precise positioning. The pressure piece with a diameter of 36 on the back ensures that the underbearings are not damaged during installation, which further increases the installation accuracy. 2.Meets – apply some lubricant before use. When installing the head bearings, adjust the pressure piece to the front and press slowly. Observe if the head bearing is crooked and install only one side at a time. When installing a base bearing, the pressure piece must be adjusted to the back. Make sure that the bearing shells are not crooked to avoid the bearings being damaged during installation. 3.Easy to use: the Thandle provides better torque control, and the threaded rod is adjustable in length (max 150 mm) to allow different widths of components. Washers and locking nuts provide extra stability during the installation process. 4.Use: Usually it is used when assembling bicycles to ensure that the head bearings and bottom bearings are installed correctly. It is also used to replace worn head bearings or underbearings. Especially suitable for situations that require precise alignment and even pressure.