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.
Classroom locks are widely used. The working principle is roughly that the outer lever is locked or unlocked with a key, and the inner lever is always free to operate the latch for exit. The latch is retracted by lever from either side, unless the exterior is locked by a key. Unlock from the outside with a key. Internal leverage can always be withdrawn freely and immediately. There is classroom lock supply here, welcome to consult and order.