【Easy to install】 Before use, please dry the surface with a clean cloth to ensure that there is no water or dust and the surface is smooth; remove the film from the suction cups, lay them flat on a smooth surface, turn the handle and press down, this will create a very strong vacuum which will lock them firmly in place. Then lift the lever to release it. 【Multiple uses】 Suction cups with hooks are ideal for camping enthusiasts, easy to carry when traveling, suitable for awnings, car tents, skylights , homes, offices and as hooks for bathrooms, kitchens and doors. Our suction cup hooks are only designed for use on smooth, flat surfaces like glass, wood panels, metal, cars, etc. 【Caution】 They are not suitable for use on concrete walls or uneven surfaces. Surfaces with water cannot be absorbed. If the suction cup hooks are a little dry and hard before use, you can soak them in warm water for a few minutes to soften the soft rubber suction cups on the bottom, dry them, and then reuse