Features: 1. Made of high-quality metal, wear-resistant and durable. 2. The chuck can clamp 0.3-3.4mm shank diameter tools such as drill bits, used for drilling, polishing, and grinding. 3. The chuck adopts a non-slip texture design, which can be easily tightened by hand. 4. The brass connecting rod has different hole diameters and can be mounted in the motor shaft within the corresponding diameter. 5. Compatible with most rotary tools such as mini electric drill, electric grinder, etc. Specification: Material: Brass + Aluminum Alloy Clamping Range: 0.3-3.4mm Outer Diameter: 10mm Package Weight: 25g (Approx.) Package List: 1 x Chuck 1 x Connecting Rod 1 x Hex Wrench