Milwaukee 1/4in Drive 3in Extension features the largest knurling surface, providing superior control for various tasks. The knurling on the female drive end enhances grip during hand-tightening or when working with oily materials, ensuring precision and ease of use. Some extensions also have knurling on the shaft for additional control. Its chrome plating excellent corrosion and rust protection, making it durable for long-term use. This extension is part of Milwaukee’s Mechanics Hand Tools line, all backed by a lifetime for reliable performance and peace of mind. Model Number: 43-24-9111