This flat washer assortment kit includes the 10 most popular stainless SAE flat washer sizes. The sizes included are #4, #6, #8, #10, #12, 1/4", 5/16", 3/8", 7/16" & 1/2". A total of 340 standard type 316 stainless SAE flat washers all neatly stored in a durable (7"x4"x1-1/2") Tuff-Tainer storage box. Quantity breakdown: #4 (50pcs), #6 (50pcs), #8 (50pcs), #10 (50pcs), #12 (30pcs), 1/4" (30pcs), 5/16" (30pcs), 3/8 (30pcs), 7/16 (10pcs) & 1/2" (10pcs).