Flat Washer, Flat Washer Type Standard, Dimensional Standards DIN 125-1A, Material Stainless Steel, Material Grade/Class 316, Finish Plain, For Screw Size M30, Inside Diameter 31 mm, Outside Diameter 56 mm, Maximum Thickness 4 mm, System of Measurement Metric, Minimum Thickness 4 mm, Pack Size Small Pack, Package Quantity 5