National Cash Register Reproduction Keys #1, #2/3, #4, #5, #6. Fits 400 class cash registers. The #1 key lock is located on the upper right-side, this key lock opens the small Dollar and Cents windows above the  key checks. The 2/3 lock is located below the key stems on the front of the cash register. The #4 lock is located on the drawer front. The #5 key lock is located on the printer cover, this lock, locks the printer cover on the printer. The #6 key locks are located on the brass lift up covers on the front of the cash register. Free shipping to the lower 48 States.  E-mail any questions.