Split Lock Washer Finish Zinc Plated Material Steel For Screw Size #12 Inside Diameter 0.22 in Outside Diameter 0.497 in Maximum Thickness 0.08 in Minimum Thickness 0.08 in Color Silver Dimensional Standards ASME B18.21.1 Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness C38 Thickness Tolerance +0.006 in Package Quantity 100