UNION case only operated by euro profile cylinder (supplied separately); case size 56mm; 8mm follower; satin chrome forend finish; deadbolt is locked or unlocked from either side using euro profile double cylinder. Reversible latchbolt withdrawn by lever handle or by key from either side.12mm single single throw unless engaging 3 point locking system 24mm double throw; To operate as 3 point locking; lift handle to engage shoot bolts. Deadbolt is then thrown by key (once or twice) to deadlock shoot olts; handles then become inoperative.