DIMENSION : The rectangle dimension is 2.58'' X 1.78'' while the round one's diameter is 1.58''.</br>STRONG 3M ADHESIVE : These metal plates have 3M adhesive on the back.Secure 3m metal plate. It will not come off and no sticky residual after detaching.</br>ULTRATHIN ULTRALIGHT PLATE : Fits under your phone's decorative case so as not to detract from its appearance?? no burden.</br>COMPATIBILITY : These car metal plates themselves are not magnetic?? but they can work with all magnetic car phone mount holder</br>EASY TO USE : The phone gently close to the car mount can automatically suck??one hand can easily operate??to ensure that your traffic safety</br></br>Product Description</br></br><B>Woo! Please see here! Magne is the America #1 mount metal plate replacement of your car magnet mount! Having a spare magnetic plate to go with your magnet mount is never harmful.Please trust that they are extremely useful to make the magnet mount work.</B><BR><BR>1.Rectangular metal magnetic plates to attach device onto magnet mounts.<BR><BR>2.The magnetic plate mount easily sticks to the back of devices for easy mounting.<BR><br>3.Works with magnet mounts designed to hold devices with the metal plate.<BR><br>4.Great to use with smartphones and tabl