This flat washer assortment kit includes 10 different sizes of type 316 stainless steel common style flat washers. The sizes included are #4, #6, #8, #10, #12, 1/4", 5/16", 3/8", 7/16" & 1/2". A total of 340 top grade stainless T316 flat washers all neatly stored in a durable (7"x4"x1-1/2") Tuff-Tainer storage box.