The scope of application is wide: Especially suitable for leather handicrafts decoration, document, book, DIY crafts and album etc. bookbinding. Widely Used As The Book or Photo Print Albums Binding Supplies. It Also Can Be Used in the Production of Saddles and Leather Purses. Easy to install and remove, can be used repeatedly: Strong metal texture, perfect decoration effect, high hardness, easy to binding, good tightness. Hard, Sturdy and Durable, with Brass Plated On the Surface, Not Easy To Get Rust and Erosion. Quality material: Scrapbook Extenders Post made of quality carbon steel material, sturdy and anti-rust. uniform coating, round and smooth, with beautiful appearance to give good luster. Product Size: Screw and base diameter is 9mm (0.35 inch) , post diameter is 4.5mm (0.18 inch) , 6 kind of post length are 4mm (1/6 inch) , 5mm (3/16 inch) , 6mm (1/4 inch) , 8mm (5/16 inch) , 10mm (3/8 inch) , 12mm (1/2 inch) . Package Contains: Pack of 120 sets chicago screw assorted kit. Set Includes 6 Most-used Sizes, 1 Pcs Punch Tool, 1 Pcs screwdriver.Date First Available: November 7, 2021. Country of Origin: China. Manufacturer: MIGSONDE. Item Weight: 10.8 ounces. Best Sellers Rank: #32,651 in Arts, Crafts & Sewing. Customer Reviews: 4.5 4.5 out of 5 stars 109 ratings 4.5 out of 5 stars. : B09H4P21NH. Item model number: MIGSONDE. Package Dimensions: 5.98 x 4.84 x 0.83 inches. Fastener Size: M5. Fastener Type: button. Thread Coverage: Fully Threaded. Head Type: Button. Color: BLACK. Brand: MIGSONDE. Metal Type: Carbon Steel. Thread Size: M5. Exterior Finish: Brass, Copper. Head Style: Round, Flat, Button, Binding. Drive System: Torx. Material: Carbon Steel, leather.