This is a small revolution that has now become a standard on all of our windows.  It guarantees a vital level of basic safety thanks to the joint of the mushroom into the hole, therefore making any attempts of burglary extremely difficult.  Its use, in an air cavity of 4 as well as 12mm, does not result in any change to the milling of your doors.  It is self-regulating: therefore it automatically adapts to the air of the profile, as well as deformations of the material.  Also adjustable in terms of pressure and it can be used with standard latches as well as burglar proof latches.  It guarantees better sliding of the mechanism thanks to the self-regulating mushroom.