Lock Washer Lock Washer Type External Tooth Lock Finish Zinc Plated Material Spring Steel For Screw Size M3.5 Inside Diameter 3.7 mm Outside Diameter 7 mm Maximum Thickness 0.5 mm Color Silver Dimensional Standards DIN 6798 A Material Grade/Class Not Graded Material Quality Standards 350-425 HV10 Pack Size Small Pack System of Measurement Metric Package Quantity 100