This lock nut assortment set includes 9 different sizes of type 316 stainless steel nylon insert nuts. Sizes included are 4-40, 6-32, 8-32, 10-24, 10-32, 1/4-20, 5/16-18, 3/8-16 and 1/2-13. A total of 175 high quality stainless steel lock nuts, all neatly stored in a durable storage box (7" x 4" x 1.5").