Privately transforming ordinary items into self-defense weapons is a very dangerous and potentially illegal behavior, which can pose a serious threat to the safety of oneself and others, and may also cause legal problems. Therefore, it is not recommended to do so. If you face a security threat, it is recommended to ensure your own safety through legal, safe and appropriate means, such as timely alarm, finding a safe shelter, and participating in formal self-defense skills training. Please always abide by laws and regulations, and do not take any homemade weapons that may lead to undesirable consequences and illegal risks.