This 316 stainless steel thin, jam hex nuts assortment kit includes the 8 most popular coarse and fine threaded stainless steel thin jam nut sizes. The sizes included are 1/4-20, 1/4-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 1/2-13 & 1/2-20. A total of 160 coarse & fine threaded marine grade type 316 stainless steel thin nuts neatly stored in a durable (7"x4"x1-1/2") Tuff-Tainer storage box. Quantity breakdown: 1/4-20 (25pcs), 1/4-28 (25pcs), 5/16-18 (25pcs), 5/16-24 (25pcs), 3/8-16 (20pcs), 3/8-24 (20pcs), 1/2-13" (10pcs) & 1/2-20 (10pcs).