Convenient to use: These screw posts are easy to bind and , you can use a drill to punch a 5 mm diameter hole, then install the 2 parts from 2 sides Widely Application: Perfect for leather handicrafts decoration, bookbinding, document, book, album, DIY crafts Material: stainless steel Packaging Quantity: 240Pcs (120 Pieces of Screws and 120 Pieces of Tops) Size: M5 x 5 / 10 / 15 / 25 / 35 / 45mm, Tops Thread Length: 3mm, 5mm and 6mm color:silver Package Contents: 30 * M5 * 5mm Binding Screws 30 * M5 * 10mm Binding Screws 20 * M5 * 15mm Binding Screws 20 * M5 * 25mm Binding Screws 10 * M5 * 35mm Binding Screws 10 * M5 * 45mm Binding Screws 30 * 3mm Tops 50 * 5mm Tops 40 * 6mm Tops Only the above package content, other products are not included. Note: Light 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.