Lock Washer, Lock Washer Type External Tooth Lock, Finish Plain, Material Stainless Steel, For Screw Size #8, Inside Diameter 0.168 in, Outside Diameter 0.365 in, Maximum Thickness 0.018 in, Dimensional Standards ASME B18.21.1, Material Grade/Class 410, Pack Size Small Pack, Rockwell Hardness C40, System of Measurement Inch, Package Quantity 50.