These washers are designed to be used with P/N MC-1001, MC-3006, MC-7058, MC-7013, and MC-7073, making them versatile and practical. Each bag contains 100 pieces, ensuring that you have plenty of washers on hand for all your needs. These washers are designed for use with stainless steel nut, and stem fittings, acting as a gasket to avoid leaks and ensure maximum efficiency with less waste.