10 Pairs Brass Chicago Screws Posts Belt Button For Leather Bookbinding CraftsOOTDTYFunctionThese screw posts are easy to tie and remove, You can use a drill bit to punch a 5mm diameter hole, and then install 2 parts on 2 sidesMade of carbon steel and brass, which is sturdy and durable, with nickel plated surface, Can effectively increase the corrosion resistance and decorative effectWidely used for leather handicraft decoration, Decorating document, book, photo album, bookbinding, scrap metal reservation and other DIYers. Warm Advice: Different thickness leather needs different sizes, 4mm length screws fit 4-6mm thick leather,6mm length screws fit 6-8mm thick leather,8mm length screws fit 8-10mm thick leather. Make sure this before ordering. Material: Carbon steel and brass, Color: silver, gold. Various sizes: The diameter of these screws posts are 5mm (3/16 inch),With3 with different lengths including 4mm (0.16 inch), 6mm (0.24 inch),8mm (0.3 inch)Quantity: 10 pairs/1 setNote: Transition: 1cm=10mm=0.39 inchPlease allow 0-3cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package Included:10 Pairs x Belt Buttons.