This CRL Deluxe Patch Lock slips onto the 3/8 or 1/2 inch (10 or 12 millimeter) glass and affords ease of installation, removal and security without the necessity of a permanent patch lock. Lock is accessed from one side only by keyed cylinder. Removal of lock during business hours provides a visually aesthetic frameless appearance. Easy slip-on feature means no glass fabrication is required. Lock is provided with three high security keys.