Hardened Steel Washer, Flat Washer Type Standard, Material Steel, Material Grade/Class Grade 8, Finish Black Oxide, For Screw Size 1 1/8 in, Inside Diameter 1.125 in, Outside Diameter 2 1/4 in, Maximum Thickness 0.051 in, System of Measurement Inch, Minimum Thickness 0.08 in, Material Quality Standards ASTM F436, Pack Size Small Pack, Package Quantity 5