Mortise Cylinders in Aluminum features a 5 pin "C" keyway. Threaded to screw into mortise lock body. Features a Standard 1-5/32-Inch Diameter and 1-inch length. The lock cylinders have adams rite cam for use with Kawneer, Adams Rite, and most other storefront locks. NOTE: IF YOUR LOCK IS NOT THREADING IN, TRY LOOSENING THE LOCK BODY MOUNTING SCREWS.