General description The Yale PM444 series security door bolts are concealed (mortice fixed) into the door and operate with a key for added security. Designed to throw into the door frame, they provide extra protection for your home. These bolts are available in different finishes, including brass, chrome, and white, and are suitable for various types of doors. Typically, two bolts are recommended per door for optimal security. Technical specifications Material: Brass Finish: Brass (also available in chrome and white) Dimensions: Length approximately 61mm, Depth approximately 19mm, Height approximately 42mm Type: Security bolt Guarantee: 2 years Compatibility and accessories Designed for standard doors requiring mortice fixing Supplied with one key; additional keys can be purchased separately Installation Concealed (mortice) fixing into the door Requires two bolts per door for effective security Operated with the supplied key, locking the bolt into the door frame Usage Use to secure