Chicago screws: 5 sizes, 16 set for each size, 80 pieces chicago screws in .5 Different sizes: Post diameter is 5 mm, 5 kind of post length are 6mm, 10mm, 12mm, 15mm, 18mm; Screw and diameter is 9.5 mm. box: Packed in a small clear box and partition put according to the sizes, make you to find the component quicklyWide application: Suit for leather handicrafts decoration, bookbinding, document, book, album, , etc.Material:Carbon steelcolour:silverPackage Contents:16 sets * Chicago screws (5 x 6 mm)16 sets * Chicago screws (5 x 10 mm)16 sets * Chicago screws (5 x 12 mm)16 sets * Chicago screws (5 x 15 mm)16 sets * Chicago screws (5 x 18 mm)1 * transparent boxOnly the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.