Flat Washer, Flat Washer Type Standard, Dimensional Standards DIN 9021, Material Stainless Steel, Material Grade/Class 18-8, Finish Plain, For Screw Size M18, Inside Diameter 20 mm, Outside Diameter 56 mm, Maximum Thickness 4 mm, System of Measurement Metric, Minimum Thickness 4 mm, Pack Size Small Pack, Rockwell Hardness Not Rated, Package Quantity 10