Split Lock Washer, Lock Washer Type Split Lock, Finish Blue Phosphate, Material Alloy Steel, For Screw Size M4, Inside Diameter 4.5 mm, Outside Diameter 7.3 mm, Maximum Thickness 1 mm, Minimum Thickness 1 mm, Color Blue, Dimensional Standards DIN 127, Material Grade/Class Not Graded, Pack Size Small Pack, Rockwell Hardness HRC44, System of Measurement Metric, Thickness Tolerance +/-0.1 mm, Package Quantity 100