90 Sets M5 6-30mm Nickel Plating Phillips Chicago Binding Posts Stud Screws Rivet Button Bookbinding.    Features:  1. Easy to Use, easily applied with standard screwdriver. Threaded post lets you open and re-attach piece where needed.  2. This kit includes Contains 9 commonly used sizes, enough for you to use.  3. Packed in a rugged convenient re-sealable plastic storage case.  4. Widely used as the book or photo print albums binding supplies. it also can be used in the production of saddles and leather purses.      Specification:  Material: Steel;  Surface Treatment: Nickel Plating;  Length: 6mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, 25mm, 30mm;    Package Included:  Item Size Quantity Binding Post 5*6mm 10;  Binding Post 5*8mm 10;  Binding Post 5*10mm 10;  Binding Post 5*12mm 10;  Binding Post 5*15mm 10;  Binding Post 5*18mm 10;  Binding Post 5*20mm 10;  Binding Post 5*25mm 10;  Binding Post 5*30mm 10;  Phillips Screw         5mm      90;  Total Quantity: 180Pcs (90 Sets)