Features: Engineered with high strength alloy steel and high frequency quenching treatments, this screwdriver bit extension rod doubles hardness for industrial grade durability, ensuring stable performances. The quick releases chucks design enables rapid bit changes with high concentricity alignment, minimizing operational errors while maintaining accuracy for 1/4" hexagonal shank bits and double ended accessories. Ideal for mechanics, engineers, and construction crews requiring efficient torques transmission tools, it withstands repetitive use in automotive repairs, machinery maintenance, and equipment assembly tasks. Compact yet robust, this lightweight 46g extension rod fits effortlessly into tool belts or drill cases, making it indispensable for mobile technicians and DIYers tackling projects in tight spaces. Featuring corrosions resistant aluminum housing and steel cores, it delivers long lasting wear resistance across temperature variations, optimizing efficiency for both cordless drills and pneumatic tools. Specifications: Materials: Steel Type:LA6501/LA6501cer/LA615032/LA615033(Optional) LA6501 Size:Approx.5.6x1.03cm/2.20x0.41inches LA6501cer Size:Approx.6.7x1.48cm/2.64x0.58inches LA615032 Size:Approx.6.2x1.75cm/2.44x0.69inches LA615033 Size:Approx.5.6x1.5cm/2.20x0.59inches Package Includes: 1Pc Screwdriver Head Extension Rod note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.