" SECURITY AND PRIVACY The security lock is equipped with a carry pocket bag, you can put it in a pocket or purse, can be used when staying in a hotel or other short term rental. When you fall asleep, which one outside the door cannot open the door with the key, which greatly improves your security. EASY TO USE Portable security door locks can be quickly installed and removed without any tools or drilling, an essential travel safety assistant. The first step is to open the door and insert the metal piece into the door lock slot; the second step is to close the door, then put the red handle groove on the metal part stud, installation is complete. WIDELY USED Perfect for motels, hotels, resorts , dorms, apartment security, short term rentals, bathrooms, bedrooms, etc. It can also be applied to prevent animals from going out and to prevent children from opening their foreign doors. The security of the door lock is the second protection, you must also lock your door, instead of relying on it. Portable door locks They are suitable for doors that have hinges and open inwards , there must be a proper door seal (door seal 3mm), upgraded door locks have two different sizes of door holes: 0.87 x 0.78 inch door hole; 1.18 x 0.78 inch door hole: (please measure your own door size) Not suitable for sliding doors, double doors, slatted doors and hinged doors. "