Screw cap is a kind of decorative cap made by nylon PA6 material for use with all types of woodscrews within 3.5-4.2mm diameter. It consists of a retaining washer and cap. The two-piece structure facilitates quick installation and leaves the cap difficult to remove. Cap colors are generally based on RAL standard colors and also can be customized to the customer's needs. Screw caps are good for decoration and protection when mounted on screws.