Studio view of the Bosch BL2171 black oxide drill bit showing the spiral flutes and reduced shank.
Vertical profile of the black oxide drill bit highlighting the split point tip and reduced shank design.
High-angle view looking down the spiral flutes of the black oxide drill bit attached to a silver drill chuck.
Close-up graphic of the drill bit's split point tip with text stating "No Skate Tip Helps Reduce Bit Walking".
Studio view of the Bosch BL2171 black oxide drill bit showing the spiral flutes and reduced shank.
Close-up action shot of the black oxide bit drilling a hole into a stainless steel pipe flange in a workshop setting.
Studio view of the Bosch BL2171 black oxide drill bit showing the spiral flutes and reduced shank.
Vertical profile of the black oxide drill bit highlighting the split point tip and reduced shank design.
High-angle view looking down the spiral flutes of the black oxide drill bit attached to a silver drill chuck.
Close-up graphic of the drill bit's split point tip with text stating "No Skate Tip Helps Reduce Bit Walking".
Studio view of the Bosch BL2171 black oxide drill bit showing the spiral flutes and reduced shank.
Close-up action shot of the black oxide bit drilling a hole into a stainless steel pipe flange in a workshop setting.
BOSCH

Bosch Drill Bit BL2171 11/16 Inch Black Oxide 1/2 Reduced Shank Speed Helix Split Point Replacement (HSS Metal Wood Plastic Hole Boring Alignment Tool)

Only 1 left
SKU: BL2171
$15.59 USD

Description

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Commercial-Grade 11/16-Inch Black Oxide Drill Bit with 1/2-Inch Reduced Shank, Speed Helix Flutes, and 135-Degree No-Skate Split Point

The Bosch BL2171 11/16 Inch Black Oxide Drill Bit 1/2 Inch Reduced Shank Speed Helix Split Point for Metal Wood and Plastic delivers specialized heavy-duty fractional hole boring utility and exceptional multi-substrate cutting efficiency across demanding steel sheet fabrication bays, structural timber framing jobsites, and commercial plastic conduit tracking paths. Engineered with premium high-speed steel enhanced by a wear-resistant thermal black oxide treatment coating, this high-performance layout accessory provides up to 50% longer operational lifespans than raw high-speed steel alternatives. This professional contractor solution resolves walk-off hole placement errors on slick aluminum alloy plates, frequent chip-packing stalls in deep lumber structures, and chuck compatibility restrictions by combining a self-centering 135-degree split point tip with a 1/2-inch reduced Silver and Deming shank base, an aggressive Speed Helix debris-evacuation geometry, and friction-reducing material thermal characteristics. Outfitted with an essential 11/16-inch cutting path diameter, a 6.0-inch total structural reach, a 4.0-inch operational flute deep depth rating, and cross-material profile compatibility, this robust bit optimizes subcontractor project metrics during structural column modifications, heavy framing installation runs, and utility pass-through channel routing.

Best Used For:

  • Heavy Metal Plate Drilling: Boring clean, oversized structural anchor points natively through mild steel angle iron, structural copper sheets, and commercial brass fittings without wandering.
  • Timber Framing Alterations: Drilling rapid clearance paths through thick oak, maple, and multi-layer structural lumber framing joists single-handedly for routing flexible lines.
  • Subcontractor Utility Rough-Ins: Penetrating deep schedule 40 PVC plastic sleeves, dense electrical tracking boxes, and compound building plates quickly on active worksites.

Key Performance & Safety Features

  • Speed Helix Design: Advanced aggressive flute geometry accelerates dynamic chip extraction velocities up to three times faster than standard twist bit tracks, eliminating motor stress drop indicators.
  • Black Oxide Shield Matrix: Premium thermal finish preserves cutting face sharpness and continuous lubricity, stopping structural metallurgical oxidation under extreme operational heat spikes.
  • Silver & Deming Reduced Shank: Specialized 1/2-inch stepped driver shank layout allows large 11/16-inch boring sweeps to fit securely within standard 1/2-inch power drill or drill press chuck jaws.
  • 135-Degree Split Point: Precision split point architecture bites immediately into metallic profiles on initial trigger pull, removing early surface walk-off shifts without punch indicators.
  • Heat-Dampening Core Profile: Thickened structural flute center line isolates torsional impact vibrations, stabilizing tracking trajectories while reducing field hardware fractures.

What's Included

  • (1) Bosch Daredevil™ 11/16-Inch Diameter x 6-Inch Length Black Oxide Reduced Shank Drill Bit

Technical Specifications

Specification Value
Brand Name Bosch
Model Number BL2171
Product Classification Type Reduced Shank Twist Drill Bit
Drill Cutting Diameter 11/16 in.
Total Mechanical Bit Length 6.0 in.
Active Flute Clearance Length 4.0 in.
Connection Shank Size Rating 1/2 in. Reduced Dimension
Stepped Driver Shank Type Silver & Deming Form Factor
Primary Cutting Core Metallurgy Premium High-Speed Steel (HSS)
Anti-Friction Surface Shield Thermal Black Oxide Vapor Treatment
Boring Tip Head Profile 135-Degree No-Skate Split Point
Target Application Substrates Mild Steel, Copper, Aluminum, Brass, Wood, PVC, Composites

Pro-Tip: When using this 11/16-inch broad tool through heavy iron channels, switch your drill to low gearing to run at a dampened structural RPM. Providing steady feed tracking and applying high-viscosity thread cutting oil keeps the Speed Helix flutes working safely while maximizing layout edge retention across continuous runs.