Features: 1. Made of high quality metal material, wear resistant and durable in use. 2. The chuck can clamp 0.3-3.4mm shank diameter tools like drill bits, used for drilling, polishing and grinding. 3. The chuck adopts anti-skid texture design, which can be conveniently tightened with hand. 4. The brass connection rod have different hole diameters and can be mounter into motor shaft in corresponding diameter. 5. Compatible with most of rotary tools such as mini power drill, electric grinder, etc. Specification: Material: Brass + Aluminum alloy Clamping Range: 0.3-3.4mm Outer Diameter: 10mm Mounting Hole Diameter: 2mm /2.35mm/3.17mm/5mm (Optional) Package Weight: 25g (approx.) Package List: 1 x Chuck 1 x Connection Rod 1 x Hex Wrench