What people love (and don’t love)
What people love
- High quality and well made, delivering durability for various projects.
- Extra long 12″ length is useful for reaching deep screws or holes.
- Sharp and accurate drill bit that performs well on wood and other materials.
- Good value for the price with consistent performance.
- Helps prevent splitting wood when pre-drilling for screws.
What people don’t love
- Some bits may arrive slightly curved, causing minor wobbling during use.
- Durability can decrease with heavy use; bit may wear out faster than expected.
Reliable and sharp extra-long drill bit ideal for wood and precision projects, with minor concerns about straightness and longevity.
Summary based on customer review evidence.
Quick facts
- Brand: Drill America
- Price: USD 7.18
- Rating: 4.60 (974 reviews)
The Drill America DWDA/CX125/16 aircraft extension drill bit is designed for jobs where a standard-length bit can’t reach. With a 12″ overall length and a 5/16″ cutting diameter (0.31″), it’s a practical pick for general-purpose drilling—especially when you need added reach.
You can view the current price and full details on Amazon here.
Made from high-speed steel (HSS), this bit balances hardness and toughness for wear resistance in everyday applications. The black oxide treatment adds lubricity and creates small surface pockets that help hold coolant near the cutting edge. A 135° split point helps with starting, while the spiral flutes evacuate chips up and out of the cut to reduce clogging. The round shank fits a wide variety of tool-holding systems.
- High-speed steel (HSS) construction for general-purpose applications
- Black oxide finish adds lubricity and helps retain coolant near the cutting edge
- 5/16″ cutting diameter (0.31″) with 12″ overall length for extended reach
- 135° split point and 2-flute spiral design for chip evacuation and reduced clogging
- Round shank for compatibility with a wide range of tool holding systems
If you’re comparing long-length drill bits, this one stands out as a value-focused option (priced around $7.18) with strong buyer feedback (4.6/5 from 974 reviews) and manufacturing to National Aerospace Standard 907.
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