Protect the bolts in UV exposure and water wash. Dust to prevent the Screws from Rusting Provides durable, attractive coverage for screw and nail holes Suitable for a 6g/8g screw (3mm-4mm Shank Diameter) Pan head and countersunk screws will fit in this cap. One piece hinge design. Simply put the screw through the hole, screw into place and close the cap. Material: plastic Color: White,Brown,Dark Gray,Cream color,Gray,Black,Yellow Outside Diameter - 13.4mm Inside Diameter - 10mm Hole Diameter - 5.3mm Package include: 100Pcs/Bag* Screw Cap Note: Please allow 1-5mm errors due to manual measurement. Due to light and screen setting difference, item's color may be slightly different from the pictures.