GUOXING Strong Alloy Construction: The sash jammers are made of high-quality aluminum alloy, durable and not easy to wear. White powder coated finish matches well with your windows and doors. Reinforcement Design: The back of the lock features a screw-reinforced anti-pinch arm, ensuring the base and lock arm are securely integrated for enhanced durability and to prevent loosening, providing added security for your home. Gives a sense of security. Easy to Install: Simple installation in minutes—just twist the interference arm to lock or release the window sash, ensuring safety. Wide Usage: These multifunctional sash jammers are suitable for inward and outward opening doors and windows, such as room doors, windows, bathroom doors, and balcony windows. Also ideal for motorhomes. What You Get: 4 pcs sash jammers with corresponding fixing screws, cover caps, and accessories. Provides additional security for UPVC/PVC doors or windows. Sash window locks for UPVC windows, 4 pcs sash jammers, window security locks, PVC door locks, door jammers, casement window locks, home extra security – white.