Lock Washer Lock Washer Type External Tooth Lock Finish Zinc Plated Material Spring Steel For Screw Size M4 Inside Diameter 4.3 mm Outside Diameter 8 mm Maximum Thickness 0.5 mm Color Silver Dimensional Standards DIN 6797 A Material Grade/Class Not Graded Material Quality Standards 350-425 HV10 Pack Size Small Pack System of Measurement Metric Package Quantity 100