Installation Requires Drilling 25mm Diameter Hole in Glass Provides Security and Doubles as a Knob to Open Doors Chrome Finish These CRL Cabinet Glass Door Locks work in cabinets with bypassing doors up to 6 mm thick. In its locked position the plunger from the Lock installed in the outer door extends past the edge of the inner door, keeping the doors from bypassing eachother. The plunger can be activated without the key, so it takes only seconds to secure the doors. The Lock’s design also allows it to be used as a knob to open the doors when in the unlocked position, so you don’t have to install a separate pull handle. Locks come complete with two keys and washers. Customers needing extra blank keys can order Cat. No. LKEY.