Features Enhanced Durability Construction - Key components undergo special quenching treatment, significantly increasing the lifespan of the tool for long-term reliability Automatic Clamping Force - The innovative self-tightening mechanism boosts clamping strength automatically, ensuring secure and efficient operation without manual adjustments Superior Material Strength - Crafted from high-quality high speed steel, this tool offers exceptional hardness and resistance, making it ideal for demanding tasks Wide Clamping Range - With a clamping range of 1-16mm, this drill chuck is versatile and compatible with various hardware tools, providing flexibility for multiple applications Waterproof and Rustproof Design - Engineered to withstand challenging environments, this tool maintains performance and longevity, ensuring consistent results in any setting Features: 1、Key parts of drill chuck made with special quenching treatment to improve durability 2、Automatically tighten keyl device can automatically increase the clamping force, very practical 3、This self tightening drill chuck have high strength, good rigidity, waterproof, proof, and 4、Made of good？quality high speed steel material, come with better hardn and hot hardn 5、The hardn is 52HB, clamping range from 1？16mm, and the applicable machine tool is a drilling machine Specification: Item Type: Self Tightening Drill Chuck Material: High speed steel Hardn: 52HB Accuracy: 0.01mm Clamping Range: Approx. 1 ~ 16mm / 0.04 ~ 0.63in Applicable Machine Tool: Drilling machine Package List: 1 x Self Tightening Drill Chuck Package List 1 x Self Tightening Drill Chuck