Features: These Chicago screws is make from Stainless Steels do not come loose which is reliable and antirust. The finishes is excellent, the screw head is nicely chamfered (tapered offs), slot is low profiled and have a professional appearance,. Easy to use, and you only need to install two part from both side to achieve the binding effect. Can be easy to remove and install Suitable for leather handicrafts decorations, bookbinding, document, scrapbooks, photo,book, album binding, belt repair, DIY crafts, etc. All the screws packed in a clear storage box. The screws is arranged according to size, you can easily store and find the size you need. Specifications: Material: Stainless Steels Rod diameter: 5mm/0.20inch Screw and base diameter: 10mm/0.39inch Rod length: 6mm/0.23inch, 8mm/0.31inch, 10mm/0.39inch, 12mm/0.47inch, 15mm/0.59inch, 18mm/0.71inch, 20mm/0.79inch, 25mm/0.98inch, 30mm/1.18inch Package Includes: 10Set 5x6mm 10Set 5x8mm 10Set 5x10mm 10Set 5x12mm 10Set 5x15mm 10Set 5x18mm 10Set 5x20mm 10Set 5x25mm 10Set 5x30mm 1pc clear storage box note: Please allow 1-2cm errors due to manual measurement, make sure that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.