Specifications: There are 13 models of crinkle washers, the quantity is 320, respectively M3 x 6 x0.3/30pcs; M4 x 8x0.3 / 30pcs; M5 x 10 x0.3 / 30pcs; M6 x 12x0.3 / 30pcs; M8 x13x0.3 / 30pcs; M10 x 15 x0.3 / 30pcs; M12x 18 x0.3 / 30pcs; M14 x 21x0.3 / 30pcs; M16 x21x0.3 / 20pcs; M19 x 25x0.3 / 20pcs; M24x 31x0.4 / 20pcs; M27 x 34 x0.5 / 10pcs; M31 x 39 x0.5 / 10pcs Purpose: The corrugated washer with box is usually used to evenly distribute the load of bolts, screws and nuts when tightening fasteners Convenient storage: Carbon steel washers are placed in a transparent plastic box for easy storage and retrieval Material: Washers Assortment Kit is made of carbon steel, which can provide good strength, hardness and wear resistance Application: Compressed height wave washers are suitable for electrical connection of household and commercial appliances and can be used for interior or exterior woodworking