【Auxiliary Locks for Sash Windows, for Safety】These are auxiliary locks for sash windows. They are easily installed by inserting them into the sash groove and rotating the knob. Install them on your sash windows to prevent intrusion. They can be used for crime prevention measures for burglars, thieves, and women living alone, as well as for safety measures in homes with pets or young children. We recommend installing them in two places, top and bottom, to enhance the crime prevention effect. Please note that this product is not an absolute guarantee against theft. 【Excellent Impact Resistance and Durability】Made of die-cast steel + rubber, these sash stoppers are impact-resistant and durable. The large knob makes it easy to turn and tighten. The auxiliary lock for windows buys you time against intrusion. 【Ventilate While Preventing Crime】 Even in homes with children who have learned to open windows, you can ventilate while preventing them from going out onto the veranda. You can lock the window frame with a slight opening, so you can use it as a mid-stop for windows with air conditioners or ventilation fans installed. It is also convenient for ventilation in various places such as kitchens, shower rooms, toilets, and living rooms. However, the crime prevention effect will be reduced. 【Easy Installation, No Construction Required】: Opening width: 2.8CM~4.2CM No construction work is required! Insert the legs of this product into the sash groove so that they adhere to the inner window, between the outer glass frame of the window glass and the water return part of the rail. Tighten the upper knob clockwise while pressing the glass frame. *Please check that it is securely fixed. *It may not be possible to use it depending on the sash. Please check the width of the sash you are installing before purchasing. ⚠️The photos cited on the site are for illustrative purposes only! Please be sure to check the actual product photos♩ ✅We are selling products in various genres, so Please take a look ↓ #cocoruの商品 *We have opened the package once for inspection. Please understand. 25-140521 Window Lock Stopper Set of 2 Crime Prevention Auxiliary Lock Sash Window Auxiliary Lock Window Lock Window Stopper Crime Prevention Goods Key Window Lock Child Window Lock Crime Prevention Lock Door Lock Sliding Door Safety Lock Window Lock Sash Window Auxiliary Lock Window Auxiliary Lock Auxiliary Key (Brown, Set of 2)