SUPER STRONG. This Bi-Fold Door Stop uses super strong magnets to hold your doors securely in position. It works by magnetically sticking the door to a wall or parallel folding door, and releasing it when pulled. It eradicates the need for a hook or a floor damaging door stopper and it's subtle design means you don't have to compromise style. HEAVY DUTY. Unlike traditional door catches, DoorMag uses super-strong magnets to provide a secure hold in windy conditions, ensuring heavy duty doors like bi-folding doors are kept securely open no matter the weather. FIXINGS INCLUDED. They can be discreetly fitted to patio doors, bi-fold doors, French doors and more with fixings included. SIMPLE TO INSTALL. Unscrew the back plate from the magnet and use the self-tapping screws to fix in place. SPECIFICATION. 29mm dia x 61mm high., Manufacturer: Magnet Expert