120 sets of Chicago screw column per bag, 6 different sizes, M5*4,5,6,8,10, 12mm, 20 sets of each size, extra screw knife and punching device.(Note: M5 is the diameter of the pillars, 5 mm). not easy to loosen, medium pressure is not easy to damage the screw slot, suitable for flat heads and screw knives. Screws are cast with high -grade carbon steel raw materials, which are not easy to bend and can reuse leather rivet screw kits. Chicago screw column kit is widely used in belts, wallets, handbags, boots, handle/shelter/sheets, and leather cases, which is very suitable for pet collars. Whether you are a professional leather worker or a DIY enthusiast, these rivets and screws can provide safe and stylish trims for your creation.With its solid structure and multifunctional size selection, this set is a necessary supplement to any leather craft toolkit., Weight: 0.63162438063 pounds, Manufacturer: Wesafrae