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. Material: High-hardness brass, rust-resistant, wear-resistant, smooth and bright surface, waterproof, no scratches or dust. Safe & Reliable Tightness: Firmly fixes leather parts with a close-fitting threaded pillar and screw head design to prevent loosening or separation. Easy to Use: Simple design with threaded pillar and screw head, easy to install/remove with minimal strength. Multifunctional Application: Suitable for leather crafts (belts, handbags, wallets), books, clipboards, albums, etc. Provides fashionable & practical solutions for connecting leather or other components. Color: As shown. Package Contents: 30 x screw rivets. Note: Color may vary slightly due to light reflection or display differences. Measurement error: +/- 1-3mm.