11/16 in x 12 in Extra Long High Speed Steel Drill Bit - DWDDL Series

In this review the 11/16 in x 12 in Drill America DWDDL Series drill bit is evaluated for contractors, maintenance techs, and DIYers who need extra reach when drilling through iron and steel family materials. The bottom line: its combination of high-speed steel construction and extra length makes it a practical choice when a standard length bit cannot reach, offering dependable chip evacuation and broad compatibility with common toolholders.

Key Features

• High-speed steel: Provides a balance of hardness and toughness that helps resist wear when drilling into a range of ferrous materials.
• Extra long 12 in length: Gives additional reach for drilling through thick assemblies or when access is restricted without sacrificing bit stability.
• Black oxide treatment: Adds lubricity and creates micro pockets that help retain coolant near the cutting edge to reduce heat buildup.
• Round shank: Allows use with many chucks and toolholding systems for flexible setup across jobsite drills.
• Spiral flutes (right-hand cut): Evacuate chips up and out of the hole to reduce clogging during continuous drilling operations.

Who It's For

This drill bit suits maintenance crews, metal fabricators, and contractors who regularly drill deeper holes or must reach recessed locations in steel and iron-based materials. Its extra length and durable HSS substrate make it especially useful for retrofit work, through-bolting, and situations where a shorter bit would require disassembly.

Those working primarily in wood, masonry, or specialty stainless tasks may want a bit optimized for those substrates or a coated variant designed specifically for extreme hardness or corrosion resistance. For precision jig work where absolute concentricity is critical, users should ensure their chuck and setup control runout carefully.

Pros & Cons

Pros

• Good general-purpose durability for a variety of iron and steel applications thanks to the HSS material.
• Extra long length provides reach without needing extensions or alternate tooling.
• Black oxide finish helps lubricity and chip control for longer continuous drilling runs.

Cons

• Some users report mixed durability under heavy side loads or aggressive use, so it can break if overloaded or used improperly.

Specifications

Our Verdict

The DWDDL 11/16 in x 12 in HSS extra long drill bit is a practical, value-minded choice for anyone needing reach and decent wear resistance when working in iron and steel materials. It is a good buy for maintenance, fabrication, and retrofit tasks where a standard bit falls short, provided the user avoids high side loads and matches the bit to appropriate drill speeds and coolant use.

Frequently Asked Questions

Is this bit suitable for stainless steel?
It is designed for iron and steel family materials; it will work on some stainless but may wear faster than specialty stainless-grade or coated bits.

Will the round shank fit a standard drill chuck?
Yes, the round shank is compatible with a wide variety of chucks and toolholding systems but check for tightness to minimize runout.

Does the black oxide finish replace cutting coolant?
No, black oxide helps retain coolant and reduce friction but using appropriate coolant or lubricant is still recommended for prolonged drilling.