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.
Controlling an opening, not only for functionality but also for security.There are several common types of commercial door closers shown below. The most common door closer used in commercial buildings today are the Modern Type closers, with or without the cover.These closers all work in essentially the same way. As the door is opened, a spring is loaded with tension. Once the door is released, the closer spring releases the tension and closes the door.