Features: Using ABS to ensuring the lock is sturdy and durability, preventing children from accidentally opening. Easy to install without tools, simplifying tedious installation steps. The general size is suitable for most window types without the need for window replacement or additional accessories. The low-key exterior design seamlessly blends with window, without compromising the overall aesthetic of the home. ABS has excellent wear resistance and scratches resistance, and is not easily aged after long-term use. Specifications: Component: ABS plastic Dimensions: 5.5cm/2.16in(closed), 3.3cm/1.3inch(open) Practicality: Designed specifically for children, it effectively prevents children from accidentally opening window and increases family safety. Suitable for various window types, including sliding window, casement window and more, easy to install without additional tools. Package Includes: 2Pcs Children's Safety Lock note: Other accessories demoed in the pictures is not included. Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.