Pack of 40 Sets: You will receive 40 sets of 12mm metal snap fasteners, which come in black and silver; Sufficient quantity and different colours can satisfy your daily use and replacement. Size Information: Each snap kits measures about 12mm/0.47in in diamter, suitable size for bags, shirts, hats, leather bags and more. Please check the size before your order. Durable Materials: Made of high-quality metal, these press studs are not easy to rust, oxidation, deformation, stable and durable to use. The surface is smooth, with a sense of metallic luster, suitable for matching a variety of fabrics. Easy to Fit: No machine or other tools are needed, you can do it easily. Each set of snap buttons contains two parts. You only need to sew these snaps to the proper position, and then buckle the two parts together, and the installation is complete. Wide Application: The sewing snap button has a wide range of uses, can be used for most crafts production, decoration and repair as well as a variety of fabrics, such as woven bags, hats, shirts, leather, bags, etc. It is the ideal assistant for sewing and home project.