Assorted chicago screws: 5 sizes, 16 set for each size, 80 sets chicago screws in total 5 Different sizes: post diameter is 3/ 16 inch/ 5 mm, 5 kind of post length are 1/ 4 inch/ 6 mm, 3/ 8 inch/ 10 mm, 1/ 2 inch/ 12 mm, 9/ 16 inch/ 15 mm, 11/ 16 inch/ 18 mm; Screw and base diameter is 3/ 8 inch/ 10 mm Good quality: made of quality carbon steel material, plated with , sturdy and anti-rust, easy to bind, install and remove, can use repeatedly, good tightness Storage box: packed in a small clear storage box and partition put according to the sizes, make you to find the component quickly Wide application: especially suit for leather handicrafts decoration, bookbinding, document, book, album, DIY crafts, etc. Specification: Color: as picture shown Size: (Each set of screw includes 2 parts, a post and a cross head stud) Quantity: 80 sets in total Package include: 80 Sets chicago screws 1 x Clear storage box