Sealing Washer, Finish Plain, Metal Material Copper, Material Grade/Class Not Graded, For Screw Size M21, Inside Diameter 21 mm, Outside Diameter 26 mm, Maximum Thickness 2 mm, Seal Material Copper, System of Measurement Metric, Pack Size Small Pack, Heat Treatment Annealed, Seal Material Color Gray, Thickness Tolerance +/-0.20 mm, Package Quantity 25