Material: Brass Type: Arc surface Thread diameter: 2.98 mm Shaft diameter: 4mm Plane diameter: 8mm / 10mm Made of durable, durable and reusable materials. The surface is smooth, hard and thick. Standard wear-resistant head design, arched and deeper track, easier to bind or remove, reusable. It is suitable for self-made leather workshops such as belts, handbags, shoes, clothes, leather bracelets and so on. Dimension description: DK * L (mm)