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ALX50B LON (Longitude) SFIC Small Format Interchangeable Core Entrance/Office Lever Lock Finish:Satin Brass Hager BB1191 4-1/2" x 4-1/2"Schlage ALX50B LON Grade 2 Cylindrical Lever Lock, Entrance Office Function, Longitude Lever, Less Small Format Interchangeable Core Interchangeable core users can enjoy the convenience of fast rekeying without having to disassemble the lock. This feature is very useful in applications where a high frequency of core changes are needed. Perfectly suited to the ND grade 1 series, ALX also allows you to seamlessly suite between the two to gain grade 1