You are looking at one brand new one hundred pack package of Tandy Leathercraft Medium Solid Brass Double Cap Rivets. This item 1381-11 are of the finest quality rivets and offer that finished look that only double rivets can along with the strength and durability of solid brass. There are several other sizes, types and colors also available in our stecksstore. Thank you for looking. RIVET SIZES: Small: 1/4" Cap X 1/4" Post X 1/4" Base (6.9 mm x 6.9 mm x 6.9 mm) Medium: 5/16" Cap X 5/16" Post X 5/16" Base (7.9 mm x 7.9 mm x 7.9 mm) Large: 5/16" Cap X 1/2" Post X 5/16" Base (7.9 mm x 12.7 mm x 7.9 mm)