Feature These screw posts are easy for you to bind and remove, You can use a drill to punch a 5 mm diameter hole, then install the 2 parts from 2 sides Made of carbon steelBrass, which is sturdy and durable, with nickel plated surface, They can enhance the capability of corrosion resistance and decorative effect efficiently Widely applicable for leather handicrafts decoration, Decorating document, book, photo album, bookbinding, scrap booking and other diy crafts. Warmly Tips: Different Thickness Leather need Different Sizes , 4MM length Screws suits 4-6mm thick leather, 6mm length screws suits 6-8mm thick leather, 8mm length screws suits 8-10mm thick leather. Please make sure this before order. Material:Carbon SteelBrass, Color: Sliver, Gold. Assorted sizes: diameters of these screw posts are all 5 mm (3/ 16 inch), with3 different lengths, include 4 mm (0.16 inch), 6 mm (0.24 inch),8 mm (0.3 inch) Quantity: 10 Pairs/1 Set Note: Transition: 1cm=10mm=0.39inch Please allow 0-3cm error due to manual measurement. pls make sure you do not 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 includes: 10 Pairs x Belt Buttons.