Hex Locknut Assortment, Hex Type Standard Hex, Includes Washers No, Largest Thread Size 5/8 In.-18, Lock Type Nylon Insert, Number of Nuts 104, Number of Thread Sizes 11, Number of Washers 0, Nut Finish Zinc Plated, Nut Material Steel, Nut Type Hex Lock Nut, Smallest Thread Size 1/4 In.-20, Standards IFI 100/107, System of Measurement Inch, Thread Sizes #10-24, 1/2 In.-13, 1/2 In.-20, 1/4 In.-20, 1/4 In.-28, 3/8 In.-16 x 9/16 In., 3/8 In.-24, 5/16 In.-18, 5/16 In.-24, 5/8 In.-11, 5/8 In.-18