Split Lock Washer, Hi-Collar, Steel, Finish Metric Blue, Fits Bolt Sizes M12, Inside Dia. 13.0 mm, Outside Dia. 20.0 mm, Thickness 2.5 mm, Thickness Tolerance +/- 0.150 mm, Rockwell Hardness HRC 44-51, General Purpose, For Use With Socket Head Cap Screws, Meets/Exceeds DIN 7980, Package Quantity 100. This item has been restricted from sale in the following state (s): []