25 Pcs Solid Brass Domed Arc Head Stud Button Screwback Chicago Screw (4mm) Product quantity: 25 pcs Material: Pure Solid Brass Length:4mm(0.157") Size: Head diameter :10 mm(0.4",) Shaft Diameter:4mm(0.16",)Screw length:7.8mm(0.30") Applicationdecorat your bags, belts,handbags, leather bracelets, shoes, hats, and all kind of art and leather Crafts DIY