Lock Washer Lock Washer Type Internal Tooth Lock Finish Zinc Plated Material Steel For Screw Size M10 Inside Diameter 10.5 mm Outside Diameter 18 mm Maximum Thickness 0.9 mm Dimensional Standards DIN 6798 J Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness C38 to C46 System of Measurement Metric Package Quantity 100