The Milwaukee 49-66-6704 SHOCKWAVE™ Impact Duty 3/8" Drive 6" Extension is the impact-rated extension for pros who need extra reach in tight spaces with impact drivers. Engineered with Shockzone™ geometry to absorb peak torque and prevent breaking, it features a 1/4" hex input for impact driver compatibility and 3/8" square output for sockets. Custom Alloy76™ steel with proprietary heat treat delivers up to 50x life vs standard extensions, while the slim profile provides access in confined areas. Perfect for automotive, HVAC, electrical, and general fastening—your essential extension for high-torque applications that demands durability and reach.

• Impact rated – designed for use with high-torque impact drivers
• Shockzone™ geometry – absorbs peak torque to prevent breaking
• Custom Alloy76™ steel – up to 50x life vs standard extensions
• 1/4" hex input to 3/8" square output – quick socket attachment
• 6" length – extra reach in tight & confined spaces
• Slim profile – maximum access without bulk
• Ideal for automotive, HVAC, electrical & general fastening
• Milwaukee durability – built for professional jobsite abuse
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