Sealing Washer, Finish Plain, Metal Material Copper, Material Grade/Class Not Applicable, For Screw Size M40, Inside Diameter 40 mm, Outside Diameter 47 mm, Maximum Thickness 2 mm, Seal Material Copper, System of Measurement Metric, Pack Size Small Pack, Heat Treatment Annealed, Minimum Thickness 2 mm, Seal Material Color Gray, Thickness Tolerance +/- 0.2 mm, Package Quantity 10