Lock Washer Lock Washer Type External Tooth Lock Finish Plain Material Stainless Steel For Screw Size 3/4 in Inside Diameter 0.768 in Outside Diameter 1.22 in Maximum Thickness 0.047 in Dimensional Standards ASME B18.21.1 Material Grade/Class 410 Pack Size Small Pack Rockwell Hardness C40 System of Measurement Inch Package Quantity 5