Feature 1INCLUDED TOOLS: Includes 3 jaw self tightening chuck, straight lines connecting rod and hex wrench, compatible with most rotating tools. 2CLAMPING RANGE: The drill chuck can hold tools with a shank diameter of 0.33.4mm, such as drill bits, for drilling, polishing and grinding. 3SELF TIGHTENING: The collet is self tightening design, which is convenient and practical by loosening the collet with an open ended wrench. 4BRASS ROD: The straight line connecting rod is made of brass, corrosion and oxidation resistant, and the thread is not easy to wear. 5STANDARD SIZE: These tools have standard sizes, easy to install and disassemble, widely used in micro electric drills, electric mills, etc.SpecificationItem Type: Drill Chuck SetJaw: 3 JawInstallation Method: KnobClamping Range: 0.3-3.4mmMaterial: Brass, Aluminum AlloyUse: Used with micro electric drill to grind and polish the workpiece. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x 3 Jaw Chuck1 x Extension Rod1 x Hex Wrench