The union 3k74 series british standard 5 lever mortice rollerbolt sashlocks are suitable for use on timber doors hinged on the left or right and are also suitable for use on doors up to 50mm thick the lock has a deadbolt operation and is locked or unlocked by key from either side with the latch bolt being withdrawn by a lever handle from either side it has force resistant anti drill anti pick and anti saw security features and is available with square forend and striking plate with a 14mm bolt t