The removable cylinder deadbolt locks 20R-Series offer a flexible removable cylinder option which is compatible with the LSDA C500 cylinder, and many other cylinders including high security cylinders. The locks are easy to rekey, making them an excellent choice for add-ons and retrofits. Optional cylinders: Compatible with many retrofit cylinders such as LSDA C500, Ilco, GMS and most High-Security brands including Medeco, Assa, Schlage Primus, Kaba Peaks, etc.