Middle lock with a special mushroom cam designed to have more security.
Additional locking point near to the corner (127 mm) is a big advantage to have more gasket pressure and less heat loss.
The roller cams can be adjusted in order to change gasket pressure 0,8 mm (- / +) by using a 4 mm allen wrench.
Special design and easy connection with stay arm to have faster and easier montage of the windows. In addition, all dimensions of the stay arm can be screwed to be fixed directly to the profile. This way the movement of the middle lock is limited.