This is a small revolution that now involves all of our windows.  It guarantees a YOUNG level of safety that is now vital, thanks to insertion of the mushroom in the hole, therefore making burglary attempts very difficult.  Its use (in 4mm as well as in 12mm cavities) does not result in any change in the milling of your doors.  It is self-regulating: therefore it adapts automatically to the air of the profile, as well as material deformation.  It is also adjustable in pressure and can be used with standard latches or burglar resistant latches.  It guarantees better sliding of the mechanism thanks to the self-regulating mushroom.