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