Inside Diameter: #4 (0.133)Outside Diameter: 1/418-8 Stainless Steel, High Quality, provides great strength and protection against corrosion to make these washers last!Qty: 100/1000Bridge Fasteners has been a leading supplier of Fasteners, nuts, bolts, stainless hardware and contractor products for over 30 years. Quality you can trust! The flat washers evenly distribute the pressure of not only the nut but also the head of the fastener. When used, the washers prevent damage to the material as well as reduce the chance of the nut loosening fro