Specification: 1/4" Flat Washer, 50 PCS. Outside Diameter: 0.69", Inside Diameter: 0.26", Thickness: 0.05". | Material: Made of 304 Stainless Steel, Black coating finish provides great protection from corrosion resistance, high temperature resistance and high tenacity. | Performance: The Flat Washers are perfect for increasing the bearing surface under the head of fasteners by distributing the load through the washers and can ensure safe holding. | The Flat Washers can prevent bolts or nuts from pulling through the surface. | Application: Suitable for Electrical Repair, Factory Maintenance, Furniture Repair and Outdoor Construction.