Load capacity: The suckers for glass are 40mm in diameter with M5 thread. The load capacity is 2.0kg, suitable for towels, holiday decorations, brushes, keys, cups, coats, crafts, etc. Very good for black-out blinds/thermal blinds of car. Help you save space. Unique design: Plastic suction cup hooks are transparent, perfectly hidden in home decoration; metal thread can be firmly tightened and fixed, easy to disassemble, do not worry about always breaking like plastic thread. Instructions: Make sure the surface is clean and smooth, wet the suction pad (to enhanced suction), then press window suction cups against surface to release the air under the suction cup. To remove it, simply disconnect the suction from the edge of it. Material: Suction cups for glass are made of PVC plastic material, very soft, durable and reusable, not yellowing, anti-aging, not easy to fall, can meet your different hanging needs. Smooth surface application: Clear sucker pads can be used on all smooth surfaces, such as windows, mirrors and glass, ceramic tiles, metal, plastic. Ideal for bathrooms, kitchens, and caravan.