The Accentra MO5305LN-626 is a grade 2 cylindrical lock that has a 2 1/8" bore, and a 2 3/4" backset. The MO stands for Monroe lever, 05 is a Storeroom Function-you always needs the key to get in, but you can always get out the free passage. 626/US26D is a Satin Chrome Finish. These come Schlage C Conventional core keyed random with 2 change keys per lock.