Wave Washer, Material Spring Steel, Material Grade/Class Not Applicable, Finish Black Oxide, For Screw Size 3/4 in, Inside Diameter 0.762 in, Outside Diameter 1 5/64 in, Thickness 1/64 in, Overall Height 0.115 in, Type Triple Wave, System of Measurement Inch, Pack Size Small Pack, Rockwell Hardness C40 to C50, Package Quantity 25