The 444 Mortice Door Bolt is the perfect solution for additional home security. Brass Bolt This door bolt is made from solid brass. It has a polished brass finish. Star Key Operation The bolt is locked & unlocked by a turn of the star key, which is supplied. Alternatively the bolt can be operated by a fixed oval turn, when security is not the main purpose of the bolt. Double External Door Security The mortice door bolt is commonly used to add extra security to pairs of double external doors, by either the use of a pair of bolts on the slave door or by a pair of bolts...