Washer Assortment, Dimensional Standards ASME B18.21.1, Finish Zinc Plated, Includes (14) Washers 1/2 in, (15) Washers 1/2 in, (16) Washers 7/16 in, (20) Washers 3/8 in, (20) Washers 5/16 in, (20) Washers 7/16 in, (25) Washers 1/4 in, (25) Washers 3/8 in, (25) Washers 5/16 in, (30) Washers 1/4 in, (50) Flat Washers #10, (50) Split Lock Washers #10, Plastic Hanging Pak, Material Steel, Number of Sizes Included 12, Number of Washers Included 310, System of Measurement Inch