Wave Washer, Material Stainless Steel, Material Grade/Class 18-8, Finish Plain, For Screw Size 1/2 in, Inside Diameter 0.523 in, Outside Diameter 55/64 in, Thickness 1/64 in, Overall Height 0.101 in, Type Triple Wave, System of Measurement Inch, Pack Size Small Pack, Rockwell Hardness C40 to C50, Package Quantity 25