Our Shockwave™ Impact Duty™ Socket Extensions provide you with better access in hard to reach places and offers extreme impact durability in high torque applications. Our laser-etched size markings allow for fast identification of drive size and length. The dual-hole design and ring groove allow you to easily attach and remove the extensions. All Milwaukee® Shockwave™ Impact Duty™ Socket Extensions are backed by our Lifetime Guarantee and meet ASME industry standards. Milwaukee® Shockwave™ Impact Duty™ 49-66-6706 Dual Hole Socket Extension, 1/2 in, 3 in OAL