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

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.