50 Sets Chicago Screws Round Head Button Cross Screw Stud Rivet for DIY Craft Leather Repairs Decoration Accessories Package include : 50 Pcs Round Head Button and 50 pcs Cross screws Size : Head Diameter : 10mm. Round Base Diameter : 12mm. Height :11mm. Strong Durable : Made of zinc alloy and electroplated, resist wear, surface is smooth and polished. Can be used for a long time. Easy to install : punch a hole in the leather and install button stud and tighten with a Cross screwdriver. Wide Application :For leather, belts, leather bags, purses, shoes, clothes,DIY project etc.