The chuck adopts a non-slip texture design, which can be conveniently tightened by hand. Compatible with most rotary tools such as mini electric drills, electric grinders, etc. The brass connecting rod has different hole diameters and can be mounted on the motor shaft to the corresponding diameter. The chuck can clamp tools with a shank diameter of 0.3-3.2 mm, such as drill bits, used for drilling, polishing, and grinding. Made of high-quality metal, wear-resistant and durable. Features: 1. Made of high-quality metal, wear-resistant and durable. 2. The chuck can clamp tools with a shank diameter of 0.3-3.2 mm, such as drill bits, used for drilling, polishing, and grinding. 3. The chuck adopts a non-slip texture design, which can be conveniently tightened by hand. 4. The brass connecting rod has different hole diameters and can be mounted on the motor shaft to the corresponding diameter. 5. Compatible with most rotary tools such as mini electric drill, electric grinder, etc. Specification: Material: Brass + Aluminum Alloy Clamping Range: 0.3-3.2mm Outer Diameter: 10mm Mounting Hole Diameter: 2mm/2.35mm/3.17mm/5mm (Optional) Package Weight: 25g (Approx.) Package List: 1 x Chuck 1 x Connecting Rod 1 x Wrench hexagonal Quantity delivered: 3 pieces Product color: gold, silver Product size: clamping range 0.3-3.2 mm Note: Manual measurement, please allow an error of 1-3 cm.Lonvre