Nico has manufactured quality window locks for decades and now we’re pleased to announce our first door lock design. The SG ( slim gearbox ) Slave  Lock is is a simple and adaptable drive mechanism which removes the need for a cylinder and face fixed door handle for operation. It works in the cavity between the slave door and the flying mullion and is an economic and functional equivalent to traditional slave door locks. It’s a fully concealed security solution and suits door sizes from 1820mm to 2380mm.