Various Sizes: This set of metal snap buttons is versatile and high quality. There are 4 models, each with 10 sets of buttons in sizes 10mm, 12mm, 15mm and 17mm. Excellent Material: The leather button set is made of high-purity pure copper. It is durable, firmly adhered, has a smooth surface, is not easy to rust and is corrosion resistant. Complete set: Each set of snap fasteners consists of 4 parts (snap head, push button, push button, push button base). Wide range of applications: The double cap rivet is suitable for leather crafts, down jackets, windbreakers, children's clothing, binders, shoes and hats, luggage and light industrial products. Transparent storage box: The metal button craft tools can be placed in a storage box with a removable divider to separate the compartments and easily find the corresponding components.