This is a quality stainless steel hex head bolt assortment kit that includes the most popular sizes. This kit contains: 10pcs 1/4-20x3/4, 10pcs 1/4-20x1, 10pcs 1/4-20x1-1/2, 10pcs 5/16-18x3/4, 10pcs 5/16-18x1, 5pcs 5/16-18x1-1/2, 5pcs 3/8-16x3/4, 5pcs 3/8-16x1, 5pcs 3/8-16x1-1/2, 1pc Tuff Storage Container