Lock Washer, EN 1.7182 Carbon Steel, Fits Bolt Sizes 7/16 In., M11, Inside Dia. 0.45 In., Outside Dia. 0.73 In., Thickness 0.1 In., Thickness Tolerance +/- .01, Color Silver, Rockwell Hardness Min. 46 HRC, High Vibration, Dynamic Loads, Critical Bolted Joints, Extreme Conditions, For Use With Bolts, Nuts, Hex Head Cap Screws, Socket Head Cap Screws, Adhesives,Washers, Package Quantity 10