This CRL Deluxe Slip-On Lock is designed for 3/8" (10 mm) glass, and can be installed without drilling or notching the glass. In the locked position, the plunger recesses into a spring-loaded receptacle, which is mounted into the cabinet base. This is a perfect Lock for showcases in a high end retail environment or cabinets containing valuable collectables. The Lock comes complete with a finished keeper and set of three keys.