Flat Washer, Flat Washer Type Standard, Dimensional Standards ASME B18.21.1-2009 (R2016), Material Steel, Material Grade/Class Case Hardened, Finish Zinc-Plated, For Screw Size 1 1/2 in, Inside Diameter 1.563 in, Outside Diameter 3 in, Maximum Thickness 5/32 in, System of Measurement Inch, Minimum Thickness 5/32 in, Color Silver, Pack Size Small Pack, RoHS Compliant RoHS Compliant, Package Quantity 21