Smooth Operation and reliable, the ergonomic lever reduces hand fatigue. Instantly fixes stiff/wobbly handles. Material Durable, heat-resistant, corrosion-resistant, and rust-resistant door and window handles. The smooth handle prevents wear and tear on door and window surfaces. Versatile This window handle lock is suitable for UPVC windows, aluminum windows, and sliding doors, perfect for home use, replacing old doors, or building new ones. Weatherproof Design Sealed and windproof, compatible with UPVC window sashes, and easy DIY installation using the included screws and template. Engineered to enhance window security, this product features a reliable mechanism to keep windows firmly closed. It aids in improving safety and preventing drafts for a secure home environment., Manufacturer: KRFVGYQNK