Don't worry about getting locked out of your cash drawer with these APG A1 Keys for Series Classic, Series 4000, and Series 6000 Drawers. The set includes 2 keys with the A1 code, which works on all drawers with the A1 locks. Specifically, they are compatible with the APG cash drawers in the Classic, 4000, and 6000 series. It's the ideal set of replacement keys to always have on hand in case of emergencies.