POWERFUL VISUAL DETERRENT: The robust design is visible through the glass, signaling a "hard target" to opportunists and stopping break-in attempts before they start. INSTANT NO-TOOL INSTALLATION: Secure your home in seconds without drilling or screws. Simply slide the lock over your existing horizontal handles for immediate protection out of the box. PREVENTS FORCED ENTRY: Even if your door cylinder is snapped or compromised, this device braces the internal handles together, stopping the doors being opened from the outside. UNIVERSAL FRENCH DOOR FIT: Engineered specifically for standard uPVC and wooden double doors (French doors) with two horizontal handles. The sleek design blends seamlessly with your conservatory or patio. 5 YEAR MECHANICAL GUARANTEE: Engineered for durability. We stand by our build quality with a 5-Year Guarantee covering mechanical manufacturing defects for total peace of mind., Manufacturer: SHIELD HARDWARE