The security of any keyed system can quickly be compromised if keys are lost or not returned. Controlling who has access to keys can be further compromised if key blanks are available on any high street. The blank keys for patented cylinder are controlled by Yale and can only be cut by authorised dealers. With our 1000, 1500 and 2000 series patented cylinders, you will be required to present your key order card to your authorised dealers for key duplication.