DEAD LOCK 4 PIN Finish : Black Powder Coated Finish. A deadlock 4 pin is a type of door lock that has a deadbolt and a 4-pin cylinder. A deadbolt is a locking mechanism that can only be opened by a key or a knob, and provides high security and durability. A 4-pin cylinder is a part of the lock that contains 4 pins and 4 springs, and interacts with the key to lock or unlock the door. Specification : 3mm thick forend plate, 2.5mm striking plate, Closed body construction, Anti theft revolving 4 round bullet, Can be fitted in door which is thick more than 25mm, 5 Star Key.