Features Durable Metal Construction - Crafted from high-quality metal for exceptional wear resistance and impact durability, ensuring long-lasting performance in demanding applications Advanced Anti-Oxidation Coating - Polished surface features anti-oxidative and waterproof properties, providing reliable protection against corrosion and extending product lifespan Precision Engineering for Longevity - Fine and strict workmanship guarantees a consistent and reliable tool, designed to withstand rigorous use while maintaining optimal functionality Convenient Chuck Key Included - Equipped with a chuck key that allows for easy adjustments and secure tightening, ensuring your bits stay firmly in place during operation Versatile Compatibility - Ideal for use with lathes, electric drills, milling machines, and more, making it a versatile addition to your workshop or toolbox Features: 1、Cast by metal, wear resistant and anti-impact. 2、Polishing features anti-oxidative, waterproof and anti-. 3、Fine and strict workmanship ensures its long service life. 4、quipped with chuck key to adjust the chuck for proper tightn. 5、Applicable for lathe, electric drill, milling machine, etc. Specification: Features: 1. Cast by metal, wear resistant and anti-impact. 2. Polishing features anti-oxidative, waterproof and anti-. 3. Fine and strict workmanship ensures its long service life. 4. Equipped with chuck key to adjust the chuck for proper tightn. 5. Applicable for lathe, electric drill, milling machine, etc. Specification: Material: Metal Color: Shown ad pictures Clamping Range: 0.3-4mm Outer Diameter: 21.5mm/0.85in Brass Base Size: Length: 20mm/0.79in, Hole Diameter: 3.175mm/0.13in Weight: 72g/2.5oz Package list: 1 * JTO Chuck 1 * Chuck Key 1 * Brass Base 1 * Small Wrench Note: Please allow slight error due to manual measurement. Thanks for your understanding. Package List