Milwaukee 1/4in Drive 6in Extension features the largest knurling surface, providing superior control for your tasks. The knurling on the female drive end enhances grip when hand-tightening or working with oily materials, ensuring precision and ease of use. Some extensions also include knurling on the shaft for additional handling control. Its chrome plating delivers excellent corrosion and rust protection, making it durable for long-term use. This extension is part of the Milwaukee Mechanics Hand Tools collection, all backed by a lifetime , ing reliability and confidence in your work. Model Number: 43-24-9112