These are finishing washers that are designed to work with tapered screws, such as flat heads. They are used in all types of knife and gun applications, such as handles and sheaths. They work to beautify and secure your screw applications. The finishing washers come in two different sizes, #4 (fits 4-40 screw heads) and #8 (fits 8-80 screw heads). With over 20 different color options, these finishing will fit into any knife or holster making projects.