Carlisle Brass Ludlow Straight Door Bolt 110mm (L) Black Antique is a lock mechanism designed to hold shut windows and doors. The straight barrel bolt meets the requirements of additional safety and comes with a staple plus plate for easier installation. It is set to a fixed frame while the bolt is attached to the door, and is available in different sizes. CE Marked. Corrosion resistant. Made from durable malleable wrought iron.