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.Made with forged impact steel for durability in high torque applications backed by our lifetime guaranteeLaser etched markings for easy identificationLifetime guarantee covers impact sockets and extensions onlyDual hole design for easier attachmentBall detent design for superior impact socket retention