General description Made of high-quality metal, this Miniature Self-Tightening Chuck is wear-resistant and durable. It is designed to clamp tools with a shank diameter ranging from 0.3 to 3.4mm, making it suitable for various applications such as drilling, polishing, and grinding. The chuck features a non-slip texture design for easy tightening by hand. Technical specifications Material: Brass + Aluminum Alloy Clamping Range: 0.3-3.4mm Outer Diameter: 10mm Package Weight: 25g (Approx.) Compatibility and accessories Compatible with most rotary tools such as mini electric drills and electric grinders Package includes: 1 x Chuck, 1 x Connecting Rod, 1 x Hex Wrench