Specification:Material: Nickel plated steelSize and quantity:M5*6 10pcsM5*8 10pcs M5*10 10pcs M5*12 10pcs M5*15 10pcs M5*18 10pcs M5*20 10pcs M5*25 10pcs M5*30 10pcs M5 90pcsWeight: 341g / 12oz (approx.) Features: Made of high quality material, these screws and rivets are durable and sturdy. Plated surface give these screw rivets a beautiful color. The surface is quite smooth and comfortable to touch,exquisite workmanship and delicate. There are a lot of rivets in this set that you may use for many projects. Rivets are perfect accessories for craft-making such as DIY albums or books.