This easy-to-use device can be easily installed on a 300 mm/12-inch ruler, used to accurately mark the center hole spacing, making it convenient for you to install power boards, chargers, or other various devices on the wall. Simply loosen the locking screw, align the marking needle with the preset installation hole, and then tighten the screw. Place the hole position marker closely against the wall and align it with the location where you want to install the device. Use a level to ensure that the hole position is level and free from deviations, and then gently trace the hole with a The level was purchased from Temu, and the locking device needs to be equipped with three 5mm Allen screws. Although the star knob is not necessary, installing it not only makes the appearance more refined, but also makes the locking process more convenient and smooth. It is recommended to use support structures when printing and to print in the manner shown in the diagram.