304 high quality stainless steel. Stainless steel has a density of 7.93 g/cm³ and is also known as 18/8 stainless steel. It offers good workability and high toughness up to approximately 800 degrees. Includes various flat washer sizes: M2 (240 pcs), M2.5 (240 pcs), M3 (200 pcs), M4 (140 pcs), M5 (90 pcs), M6 (70 pcs), M8 (50 pcs), M10 (22 pcs), M12 (12 pcs), M14 (8 pcs), M16 (8 pcs), to meet a variety of needs. These flat washers are ideal for use with nuts to distribute load and prevent damage to surfaces. Flat washers do not provide locking functionality but help increase the contact area. Washers are organized in a storage box for easy access and to prevent loss. Ideal for electrical connections on household and commercial appliances, automotive, and marine applications where threaded fasteners or bolt-type connections are used. Suitable for use with wires and power connections requiring secure fastening.