Milwaukee SHOCKWAVE™ Impact Duty 3/8" Drive 6" Extension is designed to provide superior access in hard-to-reach areas while delivering exceptional impact durability for high torque applications. This extension features laser-etched size markings for quick and easy identification of drive size and length. Its dual-hole design and ring groove enable effortless attachment and removal, enhancing your workflow efficiency. Built to meet ASME industry standards, the SHOCKWAVE Impact Duty™ Socket Extensions come with a Lifetime , ensuring long-lasting performance and reliability. Model Number: 49-66-6704