Features Secure Grip: Holds drill bits tightly and securely, preventing slippage during use, ensuring drilling s. Long-lasting Durability: design ensures a long service life, making it suitable for prolonged and heavy-duty work, offering reliability. Easy Installation: Simple to install and disassemble, saving time and effort, enhancing efficiency when swapping out drill bits. Wide Clamp Range: Accommodates drill bits ranging from 2mm to 1m, providing versatility for various drilling needs, offering adaptability. Ergonomic Design: Keyless and self-tightening design conforms to ergonomic principles, enhancing user comfort and usability during s. Features: 1、The chuck can hold the drill bit tightly and sturdy,not easy to loose. 2、 and has long service life,suitable for long time work. 3、Easy to install and disassemble,more convenient and labor-saving. 4、Large range of clamp size which range from 2~1m,suitable for many kinds of drill bit. 5、Keyless and self-tighten type design is more in accordance with human engineering. Specification: Features: The chuck can hold the drill bit tightly and sturdy,not easy to loose. and has long service life,suitable for long time work. Easy to install and disassemble,more convenient and labor-saving. Large range of clamp size which range from 2~1m,suitable for many kinds of drill bit. Keyless and self-tighten type design is more in accordance with human engineering. Specification: Diameter:4m/1.69in Length:58mm/2.28in (3-5mm tolerance) Connection Size:1/2-20UNF Clamp Range:2 ~ 1m / 0.04 ~ 0.51in Package List: 1 x Drill Chuck Note: Before purchase, it is necessary to verify whether the connecting thread of your electric drill is 1/2-20UNF. (1/2 - 20 is the definition of thread specification. Specification: 1/2; number of threads (T): 20. UNF, UN is the standard code of inch thread, and F is fine thread). Package List