Easy to organize: : The wire and transparent knurled nut provided make it easy to organize the kitchen accessory space and carry out DIY furniture installation or maintain decorations, etc. Smooth Surface Application: Our suction cups can be vacuumed on all smooth surfaces such as windows and glass, ceramic tiles. But water can knock it down. Dimensions: diameter: 40 mm, thread height 10 mm. Quantity: 8 pieces.