Astro Tools 78005 Goliath 3/8 Drive High Torque-Saver Extension Bar Set (2.5–15 in) | Astro Pneumatic Tool

Boost reach and torque with the Goliath extension set

The Astro Tools 78005 Goliath extension bar set is engineered for modern, high-torque 3/8" impact wrenches. Spanning 2.5" to 15" in four pieces, these extensions help you access stubborn fasteners in tight spaces while maintaining a strong, stable connection. The design emphasizes efficient power transfer from your impact wrench to the fastener, making tough jobs feel more manageable without overreaching beyond recommended torque targets.

Built to perform, the Goliath extensions are crafted from precision heat-treated Cro-Mo steel. This choice of material supports durability under repeated high-torque sessions and helps maintain accurate engagement over time. A slightly larger shaft size keeps the extension robust yet compact, adding only about 2 mm of length in each direction while preserving clearance in cramped bays.

Key benefits you may notice

• 15–25% more torque to the fastener than earlier 3/8" extensions, helping you break stubborn fasteners with less effort.
• Precision heat-treated Cro-Mo steel for longevity and dependable performance in demanding tasks.
• Larger shaft size with minimal space impact—about 2 mm extra length per direction, preserving access in tight areas.
• Simple lifetime warranty process: email a photo of the damaged tool and receive a replacement shipped to you.

What you get

• Four-piece 3/8" drive extension bar set, spanning 2.5" to 15" in length.
• Designed to accompany high-performance 3/8" impact wrenches for improved leverage and reach.
• Quality construction intended to endure regular use in automotive, mechanical, and workshop settings.

Real-world use cases

In a crowded engine bay, the 2.5" extension can help you reach fasteners tucked behind nearby components. For mid- to long-reach tasks, the 10" and 15" extensions give you the extra length needed to access rear bolts without repositioning the wrench repeatedly. These extensions support steady torque delivery during wheel, brake, and suspension work, and they pair well with high-torque wrenches for fastener seating and removal alike.

Whether you’re performing routine maintenance or tackling a stubborn repair, the Goliath set is designed to reduce rework by providing a reliable path for torque transfer. The feel is crisp as the extension seats into the fastener, with a noticeable improvement in control when guiding the tool into challenging angles.

Quality and support

Crafted from Cro-Mo steel with precision heat treatment, the Goliath extensions are built to resist wear and provide consistent performance. The simple lifetime warranty offers a straightforward path to replacement if needed—contact Astro Pneumatic Tool with a photo of the damaged tool and a replacement ships promptly.

Tips for use

• Match the extension length to your access needs—shorter pieces for tight spaces, longer pieces for distant fasteners.
• Use with a compatible 3/8" drive impact wrench and avoid exceeding recommended torque for the fastener.