Bluemoona 50 Sets - Plated Brass Head Button O-ring 3/8" 10mm Stud Screwback with Screw (Bronze) Size:O-ring=10mm(3/8"), Head=6.5mm(1/4"), Bottom=10mm(3/10"), Wide=3mm(0.11"), Height=7mm(3/10") Color:Nickle, Bronze, Gold Material: Plated Brass Quantity:50Sets (Screw & Stud) Use for decorating your bags, belts,handbags, leather bracelets, shoes, Hats, and All kind of art and leather Crafts DIY