A cremone bolt secures a door or window using a surface-mounted vertical rod. The turn of a handle raises or lowers the rod into a secured position at the bottom or top of the door. This conventional mechanism is not uncommon on French doors and casement windows, but it is not as secure as contemporary locks and is chiefly used inside.
Emily Winters, Peabody’s Interiors
Mounted on the surface rather than internally, the cremone bolt is more decorative than secure.
Emily Winters, Peabody’s Interiors
A cremone bolt has vertical rods that slide into a secured position with the turn of a handle.
Door pairs don’t always have a cremone bolt on both the doors; the more lively door can be easier to operate with a sliding bolt.
360 Yardware
This surface-mounted security bolt is similar to the cremone bolt, but the rod does not run the length of the door. A flush bolt is the contemporary equivalent of this, but it is recessed into the door and hidden from view.
Actual Carriage Door Company
Dutch Doors
This sliding bolt is especially designed for Dutch doors.
360 Yardware
Another frequent bolt, revealed procuring the bottom of this gate, is called a cane bolt, due to its shape.