Bluemoona 20 Sets - Solid Brass Screw Flat Head Button 4 6 8 10mm Stud Nail Chicago Screwback Leather Belt Shaft Length 8mmx4mmx10mm Material:Solid Brass Shaft Length:8mm(0.31") 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