[DETAIL] Description: Window Stopper Advanced: Iron with rubber - Window stopper are covered with rubber, effectively increase the friction for the better use and would not damage or scratch your window and avoid any annoying noise purpose: Both Improve air circulation, use in keeping the window closing and partial opening. Use multiple layers lock in heavy window, door for adding safety. No tools are needed! How to use: Close or open the window before installing window stopper - Insert the leg closely to the window groove - Turn the knob clockwise until the product is secured Size: 6*3.5*2.5 cm [1 inch=2.54 cm] Package: 1pc Or 2pcs Or 3pcs Tips: Due to manual measurement, there is an error of 1-3 cm, which is within the normal range. Thank you for your understanding. Please check the size of the windows and products that will be installed at home. (Suitable for 15MM~30MM) Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! [ATTRIBUTES] - Origin: Mainland China - Origin: Mainland China