ENHANCED SAFETY DESIGN: Our upgraded safety design features dual fixing holes, ensuring the window lock stays firmly in place on even the heaviest windows and doors. This innovative design boosts security and includes protective pads to prevent scratches or damage to your window frames while maintaining stability. PERFECT FIT FOR YOUR WINDOWS: Designed for horizontal and vertical sliding windows and doors. Before purchasing, measure your window track height (must be greater than 0.39 or 10 cm) and width (must be less than 0.59 or 15 cm). These sliding door locks come with a robust key mechanism that secures the middle track of your window effortlessly. QUICK AND TOOLFREE INSTALLATION: No need for additional tools or drilling! Simply follow our 3step installation guide: Step 1 Position the window lock at the desired location; Step 2 Insert the gasket to protect the window track from scratches; Step 3 Use the matching key to ensure that the lock is securely in place. VERSATILE USAGE: Window security locks are ideal for securing homes, bedrooms, offices, schools, and more. Keep your loved ones safe by controlling how far the window can open, reducing the risk of accidents for children and pets. Our window locks are not only suitable for up and down windows, but also for horizontal sliding windows. PREMIUM MATERIAL: Constructed from highquality aluminum alloy, these sliding window locks offer unmatched durability and strength. Resistant to wear and tear, they stand the test of time while maintaining their sleek appearance. Rotect your property during storms and deter potential intruders with these reliable locks.