Included 4 kind of washers, 16 kind of screws and 4 kind of nuts, washers are used with and provide a greater bearing surface to prevent the nut or bolt head tearing through the fastened material. washers resist loosening through vibration. designed for mechanical install and maintance use. Feature - ColorAssorted Color - Material: Metal. - Package Size: 20 x 3.7cm. - These washers are design for home, automotive, and shop use. - Included 16 kind of different size screws and 4 kind of nut and 4 kind of gasket. Fit with your use require perfectly. - Made of metal material with rust resistant galvanized finish to ensure long time use. - Includes organizing case to store tools without risk of loss and damage. - Suitable for mounting electronics, machinery, car models, model aircraft and other supplies use. - Warm Tip: Dear buyer, Due to lighting effect, monitor's brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you! Package list: 1 x Screw Washers Set