【HIGH QUALITY MATERIAL】These suction cups are made of plastic, which is strong and waterproof, safe and durable, and not easy to yellow or deform. The suction cup is transparent in color and does not affect the overall decorative style. Strong adsorption force, soft material, no damage to the adsorption surface. The screws are made of metal, which is stable and reliable. 【KNURLED NUT】These suction cups are equipped with knurled nuts, which are accessories that are installed on the top of the suction cups. With a screw-in design, you can simply thread the nut into the screw to hang or secure objects safely and easily. 【EASY TO INSTALL AND REMOVE】Wipe the surface of the target location clean before use, then press the suction cup on the smooth and dry surface to squeeze out the air, no screws and drilling required. When disassembly, just disconnect the suction on the edge of the suction cup and it can be easily disassembled without leaving any traces. 【WIDE APPLICATION】These suction