Oval Half Cylinder Keyed 32 mm. Satin Chrome. For use with Trioving/Vingcard Marine Locks. Function Options: 1) Use 2 keyed alike cylinders for either side of the door. 2) Use 1 keyway and one Thumb-turn #11.544. 3) Use 1 option on 1 side of the door. Set up is suitable for doors up to 2 1/2 inch thick.