Irwin 66716 Black Oxide High-Speed Steel Twist Drill Bit with Aircraft Extension

Irwin 66716 Black Oxide High-Speed Steel Twist Drill Bit with Aircraft Extension

The Irwin 66716 Black Oxide High-Speed Steel Twist Drill Bit with Aircraft Extension is engineered for jobs that need more reach than a standard-length twist bit can deliver, and this family is available in sizes from 1/4" to 7/16" to match a range of extended-reach drilling tasks. Machined from premium M-2 high-speed steel, each bit offers increased durability for repeated use, while the black oxide finish resists corrosion and helps protect the cutting edge over time. A 135-degree split-point tip starts drilling immediately with less force and eliminates "walking" across the work surface, helping users achieve accurate hole placement on the first pass. The aircraft-style extension is purpose-built for extended-reach tasks and is not recommended for deep drilling applications.

Key Features

• Size Range: Available in 1/4" to 7/16" to suit a variety of extended-reach drilling applications.
• Durable Construction: Made from premium M-2 high-speed steel for increased durability in demanding drilling tasks.
• Corrosion-Resistant Finish: Black oxide finish resists corrosion and helps extend the working life of the bit.
• 135° Split-Point Tip: Starts drilling immediately with less force and eliminates "walking" across the work surface for more accurate hole placement.
• Extended Reach: Aircraft extension design is ideal for applications requiring extended reach beyond standard-length bits.
• Bit Type: Twist bit configuration suited for general-purpose drilling tasks.
• Usage Note: Not recommended for deep drilling applications; intended for extended-reach, standard-depth work.

Technical Specifications

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

Typical Applications

• Extended-Reach Drilling Applications
• Metalworking and Fabrication Tasks
• General-Purpose Twist-Bit Drilling
• Workshop and Job-Site Use

Why Irwin?

Irwin builds this drill bit family from premium M-2 high-speed steel with a corrosion-resistant black oxide finish, backed by a 135° split-point tip engineered to start cleanly and stay on target without walking. Available in sizes from 1/4" to 7/16", the aircraft extension design gives professionals and DIYers the extended reach needed for hard-to-access work, making it a dependable choice for twist-bit drilling tasks where standard-length bits fall short.