Split Lock Washer, Finish Zinc Plated, Material Steel, For Screw Size 3/8 in, Inside Diameter 0.377 in, Outside Diameter 0.738 in, Maximum Thickness 0.123 in, Minimum Thickness 0.123 in, Dimensional Standards ASME B18.21.1, Material Grade/Class Not Graded, Pack Size Small Pack, Rockwell Hardness C40 to C50, Package Quantity 50