This CRL Custom Center Lock Glass Keeper with Deadlatch Electric Strike are handed to match the appropriate Center Lock. To simplify ordering use the same handing as the lock. NOTE: Will not work with Entrance Lock configuration. These units are special order and can be shipped within a week. Please contact CRL Technical Sales at (800) 421-6144 in the U.S., or (877) 421-6144 from Canada and ask for Ext. 7700.