ADDITIONAL SAFETY AND PRIVACY: If you are one of those who do not trust hotel doors and the latches, Gooriinet portable door lock will provide extra security and privacy to you, make sure you are safe, especially when traveling or staying in hotels alone. Add an extra lock that is small but will hold your door shut firmly and allows you for peaceful sleep. The door can't be opened from the outside, not even with a key. . FIT MOST DOORS: 3 in 1 special design is suitable for most types of the door lock. Perfect for hotels, dormitories, apartments, bathrooms, bedrooms, or private rooms. Door locks also can be applied to avoid pets going out and to prevent children from opening their doors to strangers. not for sliding door , double open door , slat door, and swing out door. . SIMPLE TO USE: The hotel safety door lock is easy to install or remove without any tools. The travel lock is small, light compared to other portable locks that can be carried in your pocket or handbag to provide self-protection. It only applied door opening inward and the door crack must be over 0.12inch to ensure the single door will not be stuck, the door without seam cannot be applied. . HEAVY DUTY LOCK: Resistance door devices are made of solid metal which is durable and can serve you for a long time.304 stainless steel precision casting thickening that is strong enough not to bend with force. Greatly improves security and prevents unauthorized entry.