Material: 304 Stainless Steel, corrosion resistantSize: 1/2x1-1/4, 3/8x7/8, 5/16x3/4, 1/4x1-1/4, 1/4x1, 1/4x5/8, 10#x1/2, 8#x3/8, 6#x3/8Quantity: It contains 405pcs/9 Sizes of the most commonly used Stainless Steel washers304 Stainless steel with rust resistant galvanized finish to ensure life-time use, these quality assortment washers for home, automotive, and shop useWidely Application: Perfect for electrical connections on household and commercial appliances, automotive and marine uses in which the power source has a threaded/bolt-type connection