Irwin 66708 6" Aircraft Extens...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$3.02
Irwin 66708 6" Aircraft Extension Drill Bit, 135° Black Oxide, M-2 HSS

Irwin 66708 6" Aircraft Extension Drill Bit, 135° Black Oxide, M-2 HSS

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Model: 66712

In Stock (leaves warehouse same day if ordered before 3pm ET)

$3.02
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Irwin 66708 Aircraft Extension Drill Bits, 135° Black Oxide M-2 HSS

Irwin's 66708 aircraft extension drill bit line is engineered for drilling in hard-to-reach areas and for running wires and cable behind walls, through studs, and other tight spaces. Available in 1/8" and 3/16" diameters, each with a 6" fractional straight shank, these bits are constructed of M-2 high speed steel for the best combination of strength, heat resistance, and wear resistance on demanding jobs in the field or shop. A 135° split point tip ensures a true start and eliminates bit walking, while the black oxide coating resists corrosion and extends bit life. Designed for general use in wood, metal, and plastic, these individually carded bits are a reliable addition to any electrician's, contractor's, or DIYer's toolkit.

Key Features

  • Trade Size: Available in 1/8" and 3/16" diameters, each with a 6" aircraft extension length that lets these bits reach deep into walls, joists, and other hard-to-access areas where a standard-length bit won't fit.
  • Durable Construction: Manufactured from M-2 high speed steel, delivering an excellent balance of strength, heat resistance, and wear resistance for repeated use in tough materials.
  • 135° Split Point: The split-point tip ensures a true, centered start on contact and eliminates bit walking, so every hole starts exactly where you need it.
  • Black Oxide Finish: A black oxide coating resists corrosion and helps the bit hold up to moisture and repeated use over time.
  • Versatile Design: Rated for general-purpose drilling in wood, metal, and plastic, making these bits a practical choice for mixed-material jobs.
  • Extended Reach for Wire & Cable Runs: The 6" aircraft extension shank is purpose-built for running wires and cable through studs, joists, and other hard-to-reach framing.
  • Fractional Straight Shank: Compatible with standard drill chucks for quick, secure mounting in corded or cordless drills.
  • Individually Carded Packaging: Packaged for retail display and easy identification on the shelf.

Technical Specifications

  • Bit Type: Twist
  • Warranty: NLW
  • Claims Needed: No
  • Country of Origin: China
  • Battery Included: No
  • Power Source: Non-Energy Using

Typical Applications

  • Metalworking and Fabrication
  • Woodworking Projects
  • Plastic Drilling Applications
  • Electrical Wiring and Cable Runs Through Studs
  • Hard-to-Reach Drilling Applications
  • General Home Improvement Projects

Why Irwin?

Irwin's 66708 aircraft extension drill bits are built from M-2 high speed steel and finished with a black oxide coating for added corrosion resistance and long-term durability. The 135° split point provides a true, walk-free start for accurate, clean holes every time, and the extended 6" aircraft length makes these bits a go-to choice for running wire and cable through hard-to-reach framing. Choose Irwin for dependable, professional-grade drill bits built to perform on the jobsite.

Manufacturer Resources

Product Specs

Warranty:
NLW
Bit Type:
Twist
Claims Needed:
No
Individual Vs. Set (Syndigo):
INDIVIDUAL
Product Material Group:
METAL
Battery Included:
No
Power Source:
NON-ENERGY USING
list_batch:
IRW-20260923
Product Type:
Drill Bit
Product Finish:
Black Oxide
Department:
Electrical
Product Subgroup:
Drill & Driver Bits
Product Material:
M-2 High Speed Steel
Product Group:
Power Tools & Accessories

Irwin 66712 – Frequently Asked Questions

1) Will an Irwin 66708 aircraft extension bit reach through a 2x4 stud wall for a wire run?
The 66708 is a 6 inch aircraft extension bit with a fractional straight shank, so it clears a 3-1/2 inch stud with length left over for the chuck to stay off the framing. That reach is what the aircraft length is for: drilling studs and joists for wire and cable where a standard jobber bit bottoms out.
2) Is an aircraft extension bit the right choice, or should I use a longer auger or flex bit for wire runs?
Aircraft extension bits like the 66708 are short-reach tools: 6 inches, small diameter (1/8 and 3/16 inch), good for drilling through a single stud or plate and for pilot holes in tight spots where a drill body will not fit square. If you need to bore multiple studs in one pass, run cable down a wall cavity, or pull NM cable, you want a long flex bit or an auger instead. These are twist bits, so chip clearing in deep wood holes is slower than an auger.
3) What diameters does the Irwin aircraft extension drill bit come in?
Two diameters, both at 6 inches long: 1/8 inch (part 66708) and 3/16 inch (part 66712). The 1/8 inch is for pilot holes and small fish-wire paths; the 3/16 inch gives a bit more clearance and stiffness on deeper pulls.
4) Can I use the Irwin 66708 in a standard cordless drill chuck?
Yes. It has a fractional straight shank, not a hex or quick-change shank, so it mounts in any standard three-jaw chuck on a corded or cordless drill. No adapter needed, and no battery or power source comes with it.
5) Will this Irwin bit drill metal, or is it only for wood?
Both. The 66708 is made from M-2 high speed steel and rated for general-purpose drilling in wood, metal, and plastic, which is what you want on mixed-material work like drilling through a stud and then a steel plate or track.
6) Does the 135 degree split point mean I can skip a center punch?
On most work, yes. A 135 degree split point self-centers on contact and keeps the bit from walking, so you can start a hole on flat stock without punching first. On hardened or highly polished metal a punch mark still helps.
7) Do I get a set of sizes or a single bit when I order the Irwin 66708?
Single bit. Each 66708 and 66712 is an individually carded item, not a kit, so order the diameter you need in the quantity you need. There is no assortment case.
8) Does the black oxide finish on these Irwin bits matter if my bits live in a damp van or gang box?
It helps. The black oxide coating on the 66708 is a corrosion-resistant surface treatment, which is the main reason it holds up to moisture in a truck box better than a bright-finish bit. It also reduces friction and chip welding when drilling steel. It is a coating, not stainless, so wipe bits dry after a wet day.
How fast can I get the Irwin 66712 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Irwin 66712 come with a warranty?
Absolutely. The Irwin 66712 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Irwin 66712?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Irwin 66712 from ZenSupply?
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