A metal plate with a diameter of 45 mm and a thickness of 0.3 mm, perfectly adapted to magnetic car holders, it is a thin and discreet element that can be attached to the phone case or its case to ensure a secure hold of the device on holders in the car and beyond, compatible with various types of magnetic car holders, facilitates quick and secure attachment of the device while driving, without the need for mechanical clamping, self-adhesive.