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