This hat clip comes with strong adhesive No drilling required. Just tear off the protective layer on the back and on smooth hard surfaces such as tiles, metal surfaces, glass, doors, etc. Do not use it on wallpaper and rough surfaces. It is recommended to clean the wall before pasting and use it 72 hours after pasting. Installation steps: 1. Tear off one side of the adhesive. 2. Attach the peeled side of the adhesive to the hook. 3. After installing the hook, tear off the other side of the adhesive. 4. Paste the adhesive on the back and hard to remove the air. Note: After the hat rack is stuck , please wait 72 hours before hanging the hat. This effect is the best waiting time. Otherwise it not be firm. This is a newly designed hat rack, which allows you to easily use more space to improve the messy hat placement situation, making your hats easy to store and take out. Save space. Wide range of uses. The hat storage bag is suitable for a variety of hats. It can not only be used for hats, but also for hanging headphones, clothes, towels, scarves, keys, wallets, kitchen utensils, paper towels... Our hat hook can organize your hats and display them in your own style, it can be mounted behind the door or , convenient for daily baseball cap storage. It can keep the shape of baseball caps well and add color to the room.