Patlock Security Lock for French Doors- Straight Handle Security Solution! SECURITY MADE SIMPLE  Patlocks Instant French Door and Conservatory Security Lock provides a visual deterrent to any would be intruders and instant peace of mind for home owners. HOLDS INTERNAL DOOR HANDLES SECURE - This ensures that the door mechanism remains in the locked position and prevents external handles from being operated. EASY OPERATION - No keys or code required. EXTRA SECURITY - Comes with a pair of tamper resist spindles to enhance the security that Patlock provides. QUALITY DESIGN - Robust yet lightweight construction.