Premium Quality: hydraulic tools for multiple uses without any problems. Great for large projects over long periods of time. Perfect Finish: Provides excellent hole quality with smooth, silky, no excess material. This die can be used to make round holes for steel/iron/copper/aluminum/wood plates. Size: Upper Mold Outer Diameter: 40mm (Height: 20mm). Lower Mold Outer Diameter: 26mm (Height: 52mm). Please check the product size before purchasing. Thanks! Note: Suitable for thin steel, wood and rubber material plates with a thickness of 3-6mm. Materials thinner than 3mm and thicker than 6mm are not ideal and may not work effectively., Weight: 0.50265395736 pounds, Manufacturer: Comphic