Usage Tips:PACKAGE INCLUDES-1 window retainer with screws. Suitable for all common plastic, wood or metal windows and doors. STURDY AND DURABLE-Our window stays are made of high quality metal. quality, not easy to rust, strong and durable, and have a long service life. EASY INSTALLATION-Window locks are easy to install. install. Each window opener comes with screws, you only need a simple screwdriver to screw it on, easy to use, no need drill to drill. < /p > PROTECTION-Also suitable as a cat and child safety lock, safety locking system for turning and tilting and turning inward opening windows. Ventilate the room safely and bring in fresh air. APPLICATION-Our window opener is suitable for all types of sliding windows and casement windows, and can help secure windows. Note: The data are manual measurement, please allow a 1-3cm error, due to the differences between the light and the display, there will be a certain color difference, the specific received in kind prevail.