What is the Doormaster™ Professional Lock? Designed for experienced installers, Yale Doormaster™ Professional is a High Security replacement lock that has been designed for use on PVCu, composite and timber doors. Including ‘crop & mate’ technology to maximise the scope of installation, Doormaster™ Professional is the ideal solution where a high level of security is required. Why use Yale Doormaster™ Professional to replace a broken lock? The Yale Doormaster™ Professional lock makes replacing multipoint locks a simple job for the professional installer, and will replace any lock with top and bottom hooks or bolts, a 35mm or 45mm backset, and a 16mm or 20mm faceplate. A number of other features make it the ideal High Security replacement lock for professionals: YS170 Gearbox Featuring the latest engineering from Yale, this gearbox comes with a split follower for nightlatch function. ’Crop & Mate’ Design This flexible design feature allows professionals to cut the lock to length and position gearboxes to match locks being replaced. 3 piece keep & Uni-packer™ System All Doormaster™ Professional locks feature a three-piece keep, and for PVCu doors, our patented Uni-packer™ System comes preassembled for fast, easy and reliable installation. Secured By Design PAS 24 Capable Doormaster™ Professional has been tested to the police approved ‘Secured By Design’ standard and is PAS 24 door set capable. 10-year Guarantee Yale Doormaster™ Professional is backed by our reputation as leading home security specialists, and comes with a full 10-year guarantee. You can learn more about our Doormaster™ replacement multipoint locks, by reading the product specification, or by contacting your local stockist.