Quantity : one set (one suction cup , one O Loop Hook and one clip) - No Rust and No Corrosion Scope OF Application: suitable for smooth and no concave convex smooth surface such as ceramic tile, glass, smooth metal surface, etc, Please note： that not all tiles are adequate mounting surfaces, this product will not work over grout lines or on porous surfaces such as: WOOD, unfinished MARBLE, GRANITE, porcelain, wallpaper, natural stones Easy to use - 1. Clean the bathtub.2. Put the suction cup on the bathtub tightly. 3. Press the button on the suction cup. 4. Hook your dog leash on the suction cup. Strong Suction Cup - the suction cup is very strong, hold your pet leash on the bathtub strongly. Keep your Dog in place - When you shower and dry and groom your dog, the cleat will be your third hand to keep them always in place.you can release your hands.