SECURITY AND PRIVACY- This portable door lock provides you with extra security and privacy, greatly improving your security and preventing unauthorized entry, so the door can't be opened from the outside, not even with a key; which is a great helper for you when you are on business and trips, or live alone.EASY TO USE - Easy to install or remove, this door lock can be installed in seconds without any tools, even in emergency situations and in the dark. Just insert the metal piece into the slot of the door lock, close the door, and then put the handle groove to the stud on the metal sheet, then no one can open the door from outside.HEAVY DUTY LOCK- The door security device is made of strong stainless steel. Rugged ABS plastic cover to prevent damage to doors under pressure. Steel surfaces with electroplating and polishing technology ensure a smooth touch and minimize any injury to your skin. A strong door lock with high quality may guarantee prolonged service life.WIDELY USED - The security door stopper contains two holes of different sizes to ensure that all types of door locks are matched. Perfect for hotels, dormitories, apartments, short-term rentals, Airbnbs, bathrooms, bedrooms, or private rooms. It may also be applied to avoid pets going out, and also to prevent children from opening their doors to strangers.PORTABLE LOCK - Package comes with two inside lockers, one for my apartment door and one for travel. Size 4.3 x 1.26 x 0.4 inches with 0.78inch (2 cm) and 1.2inch (3 cm) holes, lightweight and small, you can put it in a pocket or handbag. It only suitable for swing-in door with door hole less than 1.1 inches, not for sliding door , double open door , slat door, and swing out door.