A closing system (14) of a door and window casing comprises a fixed part (15) to be anchored to a wing (12) of the casing and at least one movable part (16, 17) drivable in use between an open position and a closed position of the casing, the fixed part being suitable for anchoring to the wing along a longitudinal groove (38) formed in an edge section member (12a) of the wing (12) and the at least one movable part having a plurality of closing elements spaced apart from each other. Mounted on said fixed part is at least one securing element (21-24) for fastening to the wing, said securing element being movable between a mounting position at which it can be frontally inserted into said groove when the fixed part is brought to the mounting position on the wing and an operating position at which it is in engagement with an undercut (39, 40) formed in the groove so that a link is created between the closing system and wing.

A cremone bolt for door and window fixtures comprises a handle (12), at least one movable driving element (13, 14) for opening/closing the fixture and a motion-transmitting mechanism from the handle to the driving element, said mechanism comprising a toothed rotor (17) integral with the handle and suitable for engagement with at least one rack (18, 19) integral with at least one driving element, the cremone bolt comprising an external shell (15) defining a cavity (16) inside which the motion-transmitting mechanism is housed, said cavity (16) being open on the side facing a section bar of the fixture in use, and a cover (20) being present which can be fastened to the shell to close the opening of the cavity (16) at least partly. The external shell (15) is made of plastic material, the rotor and rack being made of metal, at least one rib (40, 41) for guiding the rack (18, 19) jutting out from the cover (20) towards the inside of said cavity (16).

A system for hooking/unhooking intended for being mounted on a window of a fitting to command fastening of a window at an end of an actuating element of the fitting suitable for acting on the window to command the automatic tilt-opening/closing thereof, said system for hooking/unhooking comprising fastening means (19, 20) kinematically connected to a handle of the window to be moved, acting on the handle, between a configuration for automatic opening wherein the end of the actuating element is fastened on the window and a configuration for manual opening in which the window is not fastened on the actuating element. When the fastening means (19, 20) is in the configuration for automatic opening the end of the actuating element (17) is fastened in a fixed position with respect to the window (13).