Bluemoona Solid Brass Screw Flat Head Button 10mm Stud Nail Chicago Leather Belt Shaft Length (8mm4mm10mm) Material:Solid Brass Shaft Length:4mm(0.157")6mm(0.23")8mm(0.31")10mm(0.39")12mm(0.47")15mm(0.59") Size: Head diameter :10 mm(0.4",) Shaft Diameter:4mm(0.16",)Screw length:7.8mm(0.30") Package Quantity:20 sets Button Stud (Screw & Stud) Use for decorating your bags, belts,handbags, leather bracelets, shoes, Hats, and All kind of art and leather Crafts DIY