Rim Cylinder: Yale B-1109-PB Replacement Rim Cylinder is a convenient everyday locking solution Suggested Use: The cylinder provides key access from only one side of the door and can be used on any nightlatch Standard Security: Easy fit product that provides a standard level of security Dimension and Colour: The lock fits doors with 38mm to 57mm thickness and comes in a Polished Brass finish Keys Supplied: Supplied with 2 standard Yale keys. Additional replacement keys can be ordered from a locksmith