Yale doormaster universal lock uses the latest patented technology from yale to ensure security and simplicity of installation it is designed to replace 100 of pvcu door locks with a 35mm or 45mm backset and a 16mm faceplate the revolutionary new range means that if a multipoint lock is broken the lock rather than the whole door can be replaced the one piece mushroom rollers ensure smooth operation and help prevent separation these easily adjustable rollers create a weather tight seal to pr