This product is a rubber-coated strong magnetic suction cup, the plastic wraps a countersunk hole-shaped strong magnet, and the material is NdFeB magnetic steel + ABS engineering plastic. It is waterproof, shatter-proof, and anti-corrosion. Installation, the plastic surface can prevent the magnet from scratching the paint or other vulnerable surfaces, and the vertical pulling force of 20mm diameter 5mm thick is about 5.5kg...