Features High-quality metal casting, wear-resistant and impact-resistant. Equipped with a chuck key to adjust the tightness of the chuck. The workmanship is fine and strict, which ensures a long service life. The polished surface has the characteristics of anti-oxidation, waterproof and anti-corrosion. Suitable for lathes, electric drills, milling machines, etc. Features: -High-quality metal casting, wear-resistant and impact-resistant. -Equipped with a chuck key to adjust the tightness of the chuck. -The workmanship is fine and strict, which ensures a long service life. -The polished surface has the characteristics of anti-oxidation, waterproof and anti-corrosion. -Suitable for lathes, electric drills, milling machines, 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   Service guarantee ：100% brand new product, all refund if unsatisfied If you have any questions, please contact our professional customer service team.   Package List