Lock Washer Lock Washer Type External Tooth Lock Finish Plain Material Stainless Steel For Screw Size #4 Inside Diameter 0.102 in Outside Diameter 0.255 in Maximum Thickness 0.015 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 0.018 in to 0.012 in Package Quantity 100