This product applies to wooden and steel doors and can be used as an entry door lock as well as a decorative lock. The Euro-style cylinder and lockbody design of the lock meets highly with the European standards. This products features a special security function. Under emergency situations, using the arc knob can simutaneously unlock both the dead and latch bolt to ensure rapid escape from the room. New multi-functional security technologies are implemented to protect the cylinder from wrenching, cutting, pulling or prying. While the fine double-row-key and the anti-wrenching bolts add more safety and reliability.