Yale Quattro hinged security door lock buying guide
Quattro is a hinged security door lock in black, white, primrose and brown, with a separate 3-point lock accessory kit available.
What a hinged security door lock is
A hinged security door sits in front of the main door on its own hinge, adding a lockable barrier that can be opened partway for ventilation or visitors without opening the main door fully.
The 3-point accessory kit
The 3-point kit adds extra locking points along the door's edge for a stronger overall hold. Browse Yale's full range, or see door hardware for other brands.