Split Lock Washer, Standard, 18-8 Stainless Steel, Finish NL-19 (r), Fits Bolt Sizes M4, M4, Inside Dia. 4.1 mm, Outside Dia. 7.6 mm, Thickness 0.90 mm, Thickness Tolerance +/- 0.2 mm, Color Silver, Rockwell Hardness C35, Metalworking, Fastening, For Use With Machine Screws and Nuts, Meets/Exceeds ANSI B 18.21. 1, Package Quantity 100. This item has been restricted from sale in the following state (s): []