Milwaukee 3pc 3/8in Dr Locking Extnsn Set delivers exceptional control and security in tight spaces, making it an essential addition to any mechanic's toolkit. Designed with the largest knurling surface on both the shaft and female drive end, this set allows for precise control when hand-tightening fasteners or working with oily materials. The durable knurled locking collar keeps the socket securely in place, while the detent hole enhances engagement with the ratchet head for improved retention. Each extension is chrome plated to resist corrosion and rust, ensuring long-lasting performance. The set also includes a compact storage rack that efficiently organizes the tools and saves drawer space. Backed by a lifetime , this extension set combines durability, convenience, and reliability for professional and DIY use. Model Number: 48-22-9361