It can make it easy for you or anyone else to install photos, paintings or other hanging ornaments.just make sure you slightly hammer on the 4 small steel nails, do not hammer on the plastic part which will easily broken.Easy installation: gently hammer the four steel nails into the concrete wall until nail end is even with the white plastic hook top. and no trace will be left.SUITABLE FOR A VARIETY SURFACES: work best on drywall,concrete wall,cinder block wall,cement walls, stickers wall, lime wall,whitewashed walls, wood, wooden doors,wallpaper walls. Perfect for home and office.Not recommended for plaster walls or older walls that are denser.perfect for apartment, home, dorm, office, school, garage. Easily removed; little or no damage; leaves almost invisible or very tiny marks on wall. Hooks can be used as picture hanger, photo frame hanger, mirror hanger, utility hanger for decor items, key chains, bags, hats, decor, art, coat hanger. It can make it easy for you or anyone else to install photos, paintings or other hanging ornaments.Do you want it? It's gonna be a good helper to your home office decoration.colour:whiteMaterial:Plastic, steel nailsPackage Contents:10 * hook with lid is 3.7cm30 * medium hook is 3cm3 * hook armrest is 5.5cmCaution:1 ,Nails are very sharp, so please use the hooks carefully in order to avoid accidentally injury fingers.2 ,Please keep the hooks away from children, place the product in safe area after use.3.Some of the walls are loose on the surface, and when they knock on nails, they are easy to knock in and but provide terrible loads.Make sure you knock the hook and pull the hook. If you can't pull the hook, you can hang the picture frame safely. Do not continue to use the hook when you pull it out.4.Just make sure you are using the right size when hanging items on the hooksNOTE: marble wall, glass ,title, stone wall ,brick wall and plasterboard are not suitable.Only the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.