Combi-Ratchet 7865S 4-Dial Sliding Combination Ratchet Lock with Key Override for Glass Display Cases This showcase display lock was designed to clear extremely tight distances between solid glass panes and features easy-to-read, black pick resistant dials Combi-Ratchet sliding glass door locks give users dual access to the lock with easy to read dials and indicators  open the display lock with the combo or key The 4 dials on the Combi-Ratchet retail display lock give up to 10,000 possible combinations that are easy to reset  key will override if you forget the combo Control retail display cases with multiple ratchet locks all with different combinations and use one key for master access  will fit up to  glass thickness The Combi-Ratchet sliding glass door hardware is perfect as a display case lock, showcase lock, retail display lock, pet tank lock, shop display locketc.