Extra Thick Oversized Washer, Flat Washer Type Standard, Dimensional Standards DIN 7349, Material Steel, Material Grade/Class Case Hardened, Finish Zinc-Plated, For Screw Size M30, Inside Diameter 31 mm, Outside Diameter 68 mm, Maximum Thickness 10 mm, System of Measurement Metric, Minimum Thickness 10 mm, Material Quality Standards 100-200 HV10, Maximum Temperature 302 Degrees F, Minimum Temperature -58 Degrees F, Pack Size Small Pack, Package Quantity 25