Surface-mounted mechanical security lock. Exclusive design registered with INPI no. 1905. The lock is fixed to the door at 4 points. For doors with a thickness of 16 to 40 mm. Different for right-hand and left-hand doors. Fixed external cylinder in solid brass. Cylinder with 13 pins that are activated simultaneously. Three 4 entrances keys in nickelled brass, which move the tongue in 2 turns.