A PERFECT ACCESSORYIt can be used for pneumatic tools, electric tools and hand tools with a hex chuck, as well as auger, grinding wheel and screwdriver bit for clamping, to achieve multiple functions of one tool. THREE-LINK COLLET STRUCTUREThree-jaw collet structure, strong clamping force, stable and fast, effectively preventing the drill bits from coming off, more reliable. EASY TO USE AND INSTALLKeyless design, quickly convert your quick-change hex screwdriver into a drill bit! HIGH QUALITYAluminum alloy + carbon steel, high hardness, wear-resistant Specification: Material: Aluminum alloy, carbon steel Size: As the picture shows Model---Hex shank---Clamping range---Material 6.35mm---0.3-6.5mm---Black aluminum alloy + carbon steel Package list: 1 x Hex Shank Chuck