• High-quality carbon steel screws, strong and durable, do not corrode or rust easily. • Equipped with 20 washers to protect leather rivet products and increase thickness to secure the rivets. • Solid plastic storage box, preventing screw loss. • Includes 20 sets of Chicago screws M5x7mm and 20 washers. • Especially suitable for decorative leather crafts. • Screw head diameter: 9.5 mm. • Cylinder diameter: 5 mm. • Cylinder height: 7 mm. • Total weight: 44.26 g. • Keep away from children due to small parts. • Consider slight size and color errors due to manual measurements.