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Ultimate Safety Protection: Designed as a reliable window restrictor, it effectively limits opening distance to prevent accidental falls. Keep your family and pets safe while enjoying fresh air, ideal for home and school use. Premium 304 Stainless Steel: Crafted from high-strength stainless steel, these window locks for upvc windows offer superior rust and corrosion resistance. Built to withstand harsh weather, ensuring long-lasting structural integrity. Adjustable & Ventilated Design: This versatile window latch allows you to customize the opening width. It perfectly balances the need for indoor airflow with strict security measures, providing a comfortable and secure environment. Easy & Secure Installation: The window safety locks come with pre-drilled holes and all necessary rust-proof screws. Enjoy a quick, rock-solid setup on UPVC and PVC frames that won't loosen over time, offering maximum stability. Broad Compatibility: The package includes 4 sets of left and right-handed window catches, providing comprehensive coverage. Perfectly compatible with most UPVC windows, serving as an essential window stopper for daily peace of mind.