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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. 

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Cylinder Thumbturn

The Cylinder Thumbturn has many advantages over other common mortise and tenon locks such as the Deadbolt. First off, the Cylinder Thumbturn can be used as a high security lock as well. Unlike a mortise and tenon lock, a Cylinder Thumbturn contains an additional step that goes beyond simple mounting and securing. The Cylinder Thumbturn is actually a double cylinder lock that consists of two hardened steel cylinders that lock into each other. These locks are considered highly secure because they contain a deadbolt that is locked inside the primary cylinder.


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