D and D provides a wide range of products for wooden and metal door applications.
such as Stainless Steel Door Hinges, Door Locks, Lever Handles, Door Closers, Exit Devices, Door Stopers, Door Bolts and Door Accessories etc, not only door hardware but also Door Opening solution.
The D and D door set product category covers mortice locks, European profile cylinders, lever handles and hinges. Since the dimensions of all these products comply with DIN standards (DIN 18251 for mortice locks, DIN 18252 for profile cylinders and DIN 18255 for lever handles), the products are compatible amongst themselves regarding their functionality. All parts of the functional units are also perfectly aligned with each other.
Single-latch locks are produced by different manufacturers and have slightly different designs, but they serve the same function and offer similar security measures. Single-latch locks are spring-loaded and have rounded metal ends that protrude from an open door. The latch retracts as it slides past the door frame and releases, securely mounting within the hollow plate on the adjoining door frame. Single-latch locks are connected to doorknobs or door handles and open with a key on the outside and a turn-style knob on the inside. When the interior knob is in the lock position, the door locks automatically when closed. The main disadvantage of a single-latch lock is the accessibility of the turn-style knob on the inside of the door.