Split Lock Washer Finish Zinc Plated Material Steel For Screw Size 1 in Inside Diameter 1.003 in Outside Diameter 1.64 in Maximum Thickness 0.202 in Minimum Thickness 0.202 in Color Silver Dimensional Standards ASME B18.21.1 Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness C38 System of Measurement Inch Thickness Tolerance +0.020 in Package Quantity 10