FJM Security 0220-KA Sliding Door Ratchet Lock with Chrome Finish, Keyed Alike Fits glass up to 1/2" thick (most typical retail display cases) Easy to install  slips on edge of glass door at any location (no boring required) Keyed alike with zinc alloy lock housing, chrome finish Perfect for single glass door display cases, trophy cases, and retail cases. Able to lock multiple retail display cases with one key