This complete door rack bolt kit is perfect for adding extra locks to your doors or windows. It acts as a secondary security due to its solid bolt that locks the frame into place. This mortice knob set is complete with a 55mm rack bolt and an oval turn knob. The rackbolt is inserted into the door or window frame instead of being surfaced mounted. This allows for concealment and provides an additional point of security. The rackbolt is easy to install and simple to use. A toothed hole in the lock is operated by an oval turn key (supplied), which allows the smooth opening and closing of the bolt. A strong and robust rack bolt made from solid brass as well as the oval turn knob. Both have a coating of electro-plating, providing durable and neat finish will remain intact through all internal weather conditions as well as complementing internal fittings. The length of the bolt is approximately 55mm. The external bolt is brass as well as the base material of both rack bolt and oval turn knob. The key escutcheon, receiver and face plate have a polished chrome finish. Please refer to images for dimensions. Includes: 1 x Mortice Rack Bolt, 1 key escutcheon, 1 face plate and one oval turn knob along with fixing screws. Mortice Door Rack Bolt is a simple but an effective way of enhancing the security of your doors and windows.