3.Multiple sizes: Quick Lock Washers have 7 sizes most used, M3 M4 M5 M6 M8 M10 M12, you can choose different size according to your need.^ 4.Wide application: Fixed washers widely used in machinery equipment, lawn mower, engines, cars, trucks, trailers, toys, bicycles, recreational vehicles, boats, pumps, furniture, etc.^ 5.Economic package: 280 pieces of black steel lock washers and a plastic box, each size is separated in a storage box for easy selection and storage. 7 sizes can meet your different needs.^