Lock Washer, Serrated Internal Teeth, Spring Steel 350-425 HV10, Finish Zinc Plated, Fits Bolt Sizes M20, M20, Inside Dia. 21.0 mm, Outside Dia. 33.0 mm, Thickness 1.40 mm, General Purpose, Meets/Exceeds DIN 6798 J, Package Quantity 50. This item has been restricted from sale in the following state (s): []