Easy to install and remove: 1 second Installation: Simply place the suction cup hook on a smooth surface and twist to the right. Please make the surface clean and dry before installation, keep the surface free from dust, water and oil. When you push the hook against the wall, squeeze as much air as possible between the suction cup and the surface. Super strong suction cup hook: The suction cup hook with patented suction technology ensures that the hook can withstand a maximum weight of 5 kg. Durable: The suction cup is made of high quality PVC and ABS, highly scalable and airtight. The hooks are made of metal and resist corrosion. Reusable suction cup hooks. Simply wash the suction cups in warm water and air dry them for reuse. We recommend tightening the knob every 2 months for greater stability. What surfaces can the suction cup hook be placed on? Strong suction hooks can be used on smooth, flat surfaces, such as tiles, glass, mirrors, granite, stainless steel, acrylic, laminate and any non-porous surface with a shiny surface, cannot be used on porous or rough surfaces, such as painted walls, latex paint, old tiles, cement walls.