Size: 3/8" | Outside Diameter: 1" | Inside Diameter: 7/16" | Thickness: 0.064"-0.104" Quantity: 100 washers per package Type: USS flat washer - USS is the most common standard for flat washers | Thicker than SAE Plating: zinc plated for moderate corrosion resistance | Material: low carbon steel for general use Packaged in USA and tested to meet ASME B18.21.1 standard