Lock Washer, Lock Washer Type External Tooth Lock, Finish Plain, Material Stainless Steel, For Screw Size 1/2 in, Inside Diameter 0.512 in, Outside Diameter 0.898 in, Maximum Thickness 0.039 in, Color Silver, Dimensional Standards ASME B18.21.1, For Use With -, Material Grade/Class Not Graded, Pack Size Small Pack, Rockwell Hardness B85, System of Measurement Inch, Thickness Tolerance 0.045 in to 0.037 in, Package Quantity 25