Mini chuck is made of high quality metal material, which is wear resistant and durable.Mini keyless chuck can hold tools with shank diameter from 0.3 to 3.4mm, such as drill bits, for drilling, polishing and grinding.The mini keyless chuck is designed with a non-slip texture, and the mini chuck can be easily tightened by hand.The brass connecting rod hole diameter of the mini keyless chuck is different, and can be installed on the motor shaft according to the corresponding diameter.The mini keyless chuck drilling is compatible with most rotary tools such as micro drills, grinders, etc.Can be easily tightened by hand.< p>feature:1. Made of high quality metal, wear resistant and durable.2. The chuck can hold tools such as drill bits with a shank diameter of 0.3-3.4mm for drilling, polishing, grinding, etc.3. The chuck adopts non-slip texture design, convenient to tighten by hand.4. Brass connecting rods have different openings, which can be installed on the motor shaft with the corresponding diameter.5. Compatible with most rotary tools, such as miniature electric drills, electric grinders, etc.Specification:Material: Brass + Aluminum Alloy< p>Clamping range: 0.3-3.4mmOuter diameter: 10mmInstallation hole diameter: 2mmWeight package weight: 25g (approx.)packing list:1 chuck1 connecting rod1 x hex wrench