Gardner Bender GS-366 Wire Stripper: The Multi-Tool That Actually Works

The Gardner Bender GS-366 handles solid wire from 8-20 AWG and stranded wire from 10-22 AWG — covering 90% of residential electrical work in one tool. It’s built like a professional tool but positioned for everyday contractors.

This isn’t some fancy automatic stripper. It’s a manual multi-tool that strips, cuts, crimps terminals, and re-threads bolts. Four tools in one compact design. Gardner Bender rates it with a one-year limited warranty, but the hardened steel blades suggest it’ll outlast that timeline easily.

Wire Range and Real-World Applications

The wire range tells the whole story about who should buy this tool.

Wire Type	Range	Common Uses
Solid Wire	8-20 AWG	Romex, branch circuits, outlets, switches
Stranded Wire	10-22 AWG	THHN pulls, control wiring, automotive
Terminal Crimping	10-22 AWG	Insulated and non-insulated terminals

The tool works with both copper and aluminum wire. That aluminum compatibility matters in older Montana homes where aluminum branch wiring still exists. Most strippers ignore aluminum entirely.

The crimping function handles 10-22 AWG insulated or non-insulated terminals. Not just wire stripping — actual terminal crimping in the same tool. For residential work where you’re constantly switching between stripping Romex and crimping terminals for equipment connections, this saves pocket space and time.

Build Quality and Features That Matter

At 0.3 oz out of package, this thing barely registers in a tool pouch. But lightweight doesn’t mean flimsy. The hardened steel blades cut clean without deforming wire.

The bolt cutting feature sets this apart from basic strippers. It cuts and re-threads five common bolt sizes: 4-40, 6-32, 8-32, 10-24, and 10-32. Those are the exact sizes used in electrical boxes, device mounting, and panel work. Clean up damaged threads on a ground screw without hunting for a tap and die set.

The integrated wire strip length gauge prevents over-stripping — a common amateur mistake that creates hot spots. The pliers-style nose handles pulling and looping wire, eliminating the need for needle-nose pliers on basic tasks.

Applications and Value Proposition

Gardner Bender lists these applications: residential and commercial electrical wiring projects, automotive wiring repairs and maintenance, HVAC system installation and repair, general DIY electrical projects involving copper and aluminum conductors, and small-gauge bolt cutting and re-threading for hardware tasks.

That’s marketing speak for “this handles most electrical work.” The real value shows up in specific situations:

• Service calls where you need multiple functions without lugging a full tool bag
• Panel work where you’re stripping feeders and cleaning up ground screw threads
• HVAC installations mixing different wire types and terminal connections
• Agricultural electrical work where the bolt threading feature fixes corroded hardware

Klein Tools 11063W offers more professional grade precision. The Gardner Bender GS-394 automatic stripper works faster but lacks the multi-tool features. For contractors who understand that the best tool is the one that’s actually with you when you need it, the GS-366 makes sense.

The Bottom Line

Reviews typically rate it 4.0-4.5 stars. Users praise it as affordable, versatile, and sharp, though they note basic handles and manual selection requirements.

Those “cons” miss the point. This isn’t trying to be a premium automatic stripper. It’s a reliable multi-tool that handles the wire sizes contractors actually work with, adds useful secondary functions, and maintains accessibility for working professionals. The installation guidance is dead simple: select AWG slot and squeeze for stripping, use jaw for crimping terminals, thread bolt into hole for cutting.

For Montana contractors dealing with everything from new residential to agricultural repairs, having a tool that handles copper and aluminum, strips the common ranges, crimps terminals, and cleans up bolt threads — that’s not a compromise. That’s smart purchasing.

Frequently Asked Questions

Can this stripper handle the heavy wire used in Montana’s agricultural buildings?

The GS-366 strips solid wire down to 8 AWG, which covers most branch circuit work. For heavier feeders common in agricultural service (6 AWG and larger), you’ll need a different tool. This excels at the 12 and 14 AWG circuits that make up most electrical work.

How does the aluminum wire compatibility actually work?

The tool cuts both copper and aluminum wire. The hardened steel blades don’t deform softer aluminum like some strippers do. For older homes with aluminum branch wiring, this means one tool handles everything without switching between specialized strippers.

What’s the real difference between this and Klein’s version?

Klein Tools 11063W is more professional grade and precise. Klein typically means better steel, tighter tolerances, and longer life. The Gardner Bender gives you solid functionality with practical features. Choose based on usage frequency.

Does the crimping function actually create code-compliant connections?

The tool crimps 10-22 AWG insulated or non-insulated terminals. When used properly with quality terminals, it creates reliable crimps. Not a substitute for a dedicated ratcheting crimper on critical connections, but perfectly adequate for standard terminal connections.