Widely UsedThese self-tightening chucks have a wide range of applications, they can be used for pneumatic tools, power tools and hand tools with hex chuck, as well as auger, grinding wheel and screwdriver bit for clamping, to achieve multiple functions of one tool. Professional ToolsThese self-tightening chucks have high precision and sensitivity, quickly convert your quick-change hex screwdriver into a drill bit! It can be used in handicrafts, DIY creation, and mass production. High-quality materialsThis keyless chuck is made of high-quality aluminum alloy + carbon steel material, rust-free, corrosion-resistant, and high-strength for maximum durability. Superior performance Three-jaw clamping structure, strong clamping force, stable and fast keyless chuck adapter, 0.3-6.5mm, general 6.35mm hex shank. Production guaranteeFrom the purchase of original materials to the factory product inspection, inspections must be carried out at every step, and each step has a record. The records of each quality control link in product production are traceable, and unqualified parts are never allowed to enter the next process, so that every factory product is 100% qualified. Specification: Material: Aluminum alloy, Carbon steel Size: As the picture shows Package List: 1 x Hex Shank Chuck