Hex Locknut Assortment Includes Washers No Lock Type Nylon Insert Serrated Flange Material Grade/Class Grade 2 Grade 5 Grade 8 Number of Nuts 1 255 Number of Thread Sizes 20 Number of Washers 0 Nut Finish Zinc Plated Nut Material Steel Nut Type Hex Lock Nut System of Measurement Inch/Metric Thread Sizes #10-24 #10-32 1/2 In.-13 1/4 In.-20 10-24 3/4 In.-10 3/8 In.-16 5/16 In.-18 5/8 In.-11