Large O.D. & Thick Oversized Washer, Flat Washer Type Oversized, Dimensional Standards AMPG 2001 FL.05, Material Steel, Material Grade/Class Case Hardened, Finish Zinc-Plated, For Screw Size #10, Inside Diameter 0.219 in, Outside Diameter 1 in, Maximum Thickness 1/8 in, System of Measurement Inch, Minimum Thickness 1/8 in, Color Silver, Inside Diameter Tolerance +/-0.010 in, Material Quality Standards ASTM A108, Outside Diameter Tolerance +/-0.010 in, Pack Size Small Pack, Rockwell Hardness B55