Split Lock Washer Lock Washer Type Split Lock Finish Plain Material Stainless Steel For Screw Size M4 Inside Diameter 4.1 mm Outside Diameter 7.6 mm Maximum Thickness 0.9 mm Minimum Thickness 0.9 mm Dimensional Standards DIN 127 B Material Grade/Class 18-8 Pack Size Small Pack Rockwell Hardness C35 Package Quantity 50