Yale doormaster adjustable is a high security lock designed to replace up to 90 of pvcu door locks with top and bottom hooks or bolts a 35mm backset and a 16mm faceplate its adjustable design utilises the latest patented technology from yale to ensure the lock is installer friendly making it the ideal choice where a higher level of security on a pvcu door is required 3 hooks ensure high security and anti separtation adjustable rollers create a weather tight seal to protect the interior of a hou