What people love (and don’t love)
What people love
- Hard, sharp, and durable drill bit that performs well without walking
- Good value for money with excellent price and quality
- Ideal length for reaching deep screws and drilling through tough materials
- Effective in preventing wood splitting when used properly
- Quick shipping and accurate product description
What people don’t love
- Some units may arrive slightly bent or curved, causing wobble on rotation
- Not ideal for highly precise drilling jobs due to occasional bending
- Minor complaints about durability, but generally positive overall
Highly rated drill bit praised for sharpness and value, with occasional minor quality issues.
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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