Yale Doormaster™ Professional is a High Security PVCu replacement lock designed to replace 100% of locks. With three hooks and two rollers, the Doormaster™ Professional has been tested to the Police Approved Secured By Design standard and is PAS 24 door set capable. Designed with the professional installer in mind, this lock includes Crop and Mate technology to maximise the scope of installation. Several patented features plus a choice of faceplate widths makes the Professional Lock the ideal choice where a higher level of security is required – regardless of door material. Features:Supplied with pre-assembled door keeps which use the patented ‘Uni-packer’ system for fast, easy, and reliable installation. Fixing tabs for easy and secure fitting. Rounded ends for safe installation. 10 year guarantee. Length: 92mm.The YALYDMPRO45 Doormaster Professional Replacement uPVC Lock has the following specifications: Backset: 45mm. Faceplate: 16mm.