The Yale 1109 series replacement rim cylinders are for use with surface mounted locks, such as nightlatches, operating from a tailbar. They are used to provides key access from one side of a door & are suitable for doors 38mm to 57mm in thickness.
The tailbar can be cut to suit the thickness of the door.
This Yale B1109CH Replacement Rim Cylinder comes in Polished Chrome
Supplied with two keys
Rim Finish: Polished Chrome