You can mount the CRL Single Door No-Drill Lock on the top or bottom edges of the glass door if used with the jamb-mounted strike plate, or the vertical meeting edge of double glass doors if used with the matching Strike Plate. Each Lock comes with one jamb-mounted e and two keys. For blank replacement keys cut on one side order Cat. No. BKEY; for blank replacement keys cut on two sides order Cat. No. B2KEY.