This model is a part of the Kenrick Centurion range of replacement UPVC window lock gearboxes that should be stamped with the Kenrick & Centurion labels on the cover plates & part of the ridged bar. These models come in either a 20mm or 22mm backset; they can be indentified again by markings, either CLS22 or CLS20 where the last two digits refe..