Features High quality metal molding, wear-resistant and anti-impact. Polishing surface features anti-rust, waterproof and anti-corrosion. Fine workmanship and strict workmanship ensures its long service life. joked with the chuck wrench to adjust the chuck to be tightly fitted. Applicable for lathe, electric drill, milling machine, etc. Features: 1. High-quality metal molded part, wear-resistant and anti-impact. 2. Polishing surface features of anti-oxidant, waterproof and anti-corrosion. 3. Fine workmanship and strict ensures its long service life. 4. Equipped with tightening wrench to adjust the mandrel are well adjusted. 5. Applicable for lathe, electric drill, milling machine, etc. Specification: Material: Metal Color: as advertisement sample Clamping range: 0.3-4 mm Outer diameter: 21.5 mm / 0.85in Brass Base Size: Length: 20 mm / 0.79in, Hole Diameter: 3.175 mm / 0.13in Weight: 72 g / 2.5 oz Package List: 1 x Chuck JTO 1 x Chuck Wrench 1 x Brass Base 1 x Small Key Note: Please expect small error due to manual measurement. Thank you for your understanding. Package List