Size and quantityPackage contains 800 pcs flat washers,and 1 pcs transparent packaging box.Variety of size: M2 M2.5 M3 M4 M5 M6 M8 M10 M11 M12, 10 commonly used types of flat washers can meet your different needs. MaterialFlat washer made of stainless steel material,Strong,which serves for a long using time.And smooth surface without burrs,which has better corrosion resistance quality. Packing boxPacking Box these small grids are separated individually which you can take out flat washers of different sizes easily. And the lid is marked with the corresponding size, which is more convenient for resolution. Widely usedFlat washers widely used Electric appliance for household and commercial .Any Outdoor and indoor can be Application. Function Flat washers is in order to increase the screw surface,pad to prevent screw loosening, intended for the general use under the head of a bolt.Used to reduce friction, isolation, and prevent loosening or dispersionYou can also be used to make necklaces, ornaments.