This Hex Bolt assortment kit includes 9 different sizes of type 316 stainless steel hex head bolts. The sizes included are 1/4-20 x 1/2", 1/4-20 x 3/4", 1/4-20 x 1", 1/4-20 x 1-1/2", 5/16-18 x 3/4", 5/16-18 x 1", 5/16-18 x 1-1/2", 3/8-16 x 3/4", 3/8-16 x 1" & 3/8-16 x 1-1/2". A total of 80 top grade stainless bolts all neatly stored in a durable (7"x4"x1-1/2") Tuff-Tainer storage box.