What people love (and don’t love)
What people love
- Sharp and accurate, works great for drilling and removing screws.
- Good value for the price with quick shipping.
- Durable enough for various projects like woodworking and custom builds.
- Long length allows reaching deep or hard-to-access screws.
- Helps prevent splitting wood when drilling pilot holes.
What people don’t love
- Some bits arrive slightly bent, causing wobbling during use.
- Tends to dull quickly after continuous heavy use.
- Not ideal for precision work due to occasional bending.
Reliable and affordable drill bit with good length, though some may experience durability and straightness 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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