[Chicago Screw Rivets] - Screw type: Slot; Shape: Flat round head; Base diameter: 8mm / 0.31 inches; Screw size: 4mm / 0.16 inches; Column rod length: 15mm / 0.59 inches; Total height: 19mm / 0.75 inches; Packaging: 30 sets of Chicago screw rivets [Material] - Chicago flat screws are made of high-hardness brass, which is rust-resistant, wear-resistant, and durable. The surface is smooth and bright, free from scratches and dust, and waterproof. [Safe and Reliable Tightness] - This screw column firmly fixes leather parts together to provide reliable and solid connections. The thread pillar and screw head design fit closely to prevent loosening or accidental separation. [Easy to Use] - The Chicago screw leather rivet design is simple, easy to install and disassemble. They feature a threaded pillar and screw head that can be tightened or loosened with minimal effort, allowing for easy assembly and removal of leather products. [Multifunctional Application] - These button rivets are suitable for leather craft projects such as belts, handbags, wallets, folders, books, clipboards, and album decorations. These multifunctional rivets offer stylish and practical solutions for connecting leather parts or other components. Color: As Shown Material: Brass Size: 15 x 8mm Package Contents: 30 x Screw Rivets Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement allowance is +/- 1-3cm.