Assortment of screws: 5 sizes, 16 set for each size, 80 sets of chicago in total 5 different sizes: post diameter is 3/16 inch/ 5 mm, 5 kinds of length pole 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; The diameter of the screw and base is 3/8 inch/ 10 mm Good quality: made of quality carbon steel material, plated with silver nickel, sturdy and rust-proof, easy to bind, install and remove, can use repeatedly, good sealing Storage box: packed in a small clear storage box and partition put according to sizes, make you find the component quickly p> Wide application: especially suitable for leather craft decoration, binding, document, book, album, DIY crafts, etc < p>In a storage box: The chicago carbon steel screw kit is packed by a clear storage box, which is put together according to their sizes , easy to get the desired size and convenient to carry. Good material: Made of quality carbon steel, silver nickel plated, sturdy and anti-rust , easy to bind, install and remove, can use repeatedly, good sealing. Wide application: Delicate and has good sealing effect. decoration, especially suit for decorating leather crafts, bookbinding, document, book, album, DIY crafts and etc. Details: < p>Color: silver Size: (Each screw set includes 2 parts, a post and a cross head stud) Post diameter: 3/16 inch/ 5 mm Screw and base diameter: 3/8 inch/ 10 mm Post length: 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 Quantity: each size has 16 sets, 80 sets in total < b>Package includes: 16 sets of chicago screws (5 x 6 mm) 16 sets of chicago screws (5 x 10 mm) 16 sets of chicago screws (5 x 12 mm) 16 sets of chicago screws (5 x 15 mm) 16 sets of chicago screws (5 x 18 mm) 1 x Transparent Storage Box Warm note: small parts, please keep away from child.