Latch Control Provides the ability to adjust the pivot hinge to latch the door properly. Damper Control Ensures a smooth and elegant closing movement and protects your door from touching the wall (back-check). 30º Speed Control Allows you to determine the speed of the pivot door through the last part of the closing movement. Small to oversized doors System M+ is suitable for light doors and heavy doors in a range of 80 kg to 500 kg for ultimate design freedom.