PREMIUM QUALITY- Sturdily constructed. Made of high-quality high-hardened steel for long-term use. WELL CONSTRUCTED- Adopts triangular base and thickened screw rod for ease of use & stability during bending process. CONVENIENT OPERATION- Equipped with a long handle with ergonomic design, for convenient, easy, and effortless operation. HIGH FLEXIBILITY- With adjustable roller for flexibility and easy operation. Minimum Radius: 180mm (20), 170mm (25), 200mm (30), 220 (40). Minimum Diameter: 450mm (20), 500mm (25), 550mm (30), 600 (40). PROFESSIONAL USE- This heavy-duty bender is specially suitable for square and rectangular tube bending. Can be utilized to process materials of mild steel, cooper and aluminum.