For inward opening windows, window doors on the handle side. Can be mounted on plastic, wood & aluminium. Fastening of protective device by pushing the twist lock. 2 setting closure is latest. Stage 1: light pressure on the twist lock = locking function (presence protection). Level 2: completely press the twist lock = locking function. Opening the safety device from the closed position by means of the key. Simultaneous locking can be combined with other ABUS window locks.