Chicago screws: 5 sizes, 16 set for each size, 80 pieces chicago screws in total.5 Different sizes: Post diameter is 5 mm, 5 kind of post length are 6mm, 10mm, 12mm, 15mm, 18mm; Screw and base diameter is 9.5 mm.Storage box: Packed in a small clear storage 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, DIY crafts, 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 storage boxOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.