Split Lock Washer, Spring Lock, Alloy Steel, Finish Yellow Zinc Plated, Fits Bolt Sizes 5/16 In., 5/16 In., Inside Dia. 0.314 In., Outside Dia. 0.583 In., Thickness 5/64 In., Color Gray, General Purpose, Meets/Exceeds ASME B 18.22. 1, Package Quantity 100