[Smooth Surface Application]: Our suction cups can vacuum all smooth surfaces, such as windows and glass, tiles. But water can knock it down. [EASY TO ORGANIZE]: The included wire and transparent knurled nuts make it easy to organize space for kitchen accessories, complete DIY furniture installations or fixed decorations, etc. 【Size】: diameter: 41 mm, M5 thread height: 8mm. [Quantity]: 8 pieces. We only sell suction cups, not other items in the picture. Due to the difference between different monitors, the pictures may not reflect the color actual item. Due to manual measurement, please allow slight errors in size.