Studio shot of the black Diablo 1-1/8 inch self-feed bit standing upright with a replacement feed screw next to the hex shank.
Retail packaging for the Diablo 1-1/8 inch SPEEDemon self-feed bit, featuring a clear case highlighting the 2-cutter design and size specifications.
Close-up action shot of the self-feed bit boring through a wooden stud, showing the cutter head exiting the material with wood debris.
Action shot of the black Diablo self-feed bit drilling horizontally into a light wood stud, showing the shank connected to a drill chuck.
Studio shot of the black Diablo 1-1/8 inch self-feed bit standing upright with a replacement feed screw next to the hex shank.
Retail packaging for the Diablo 1-1/8 inch SPEEDemon self-feed bit, featuring a clear case highlighting the 2-cutter design and size specifications.
Close-up action shot of the self-feed bit boring through a wooden stud, showing the cutter head exiting the material with wood debris.
Action shot of the black Diablo self-feed bit drilling horizontally into a light wood stud, showing the shank connected to a drill chuck.
DIABLO

Diablo Self Feed Drill Bit DSF1125 1-1/8 Inch SPEEDemon Head (7/16 Hex Shank 2 Cutter High Speed Steel Cordless Rough In Pipe Plumbing Boring Tool)

Only 2 left
SKU: DSF1125
$16.95 USD

Description

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High-Density 1-1/8 Inch Self-Feed Wood Drill Bit with 2-Cutter SPEEDemon Head and 7/16 Inch Hex Shank

The Diablo SPEEDemon DSF1125 1-1/8 Inch Self-Feed Drill Bit delivers an industrial architectural structural boring solution engineered to process high-speed pipe and conduit pathways through clean softwood frameworks. Forged from premium high-speed steel via an automated heat-treatment sequence, this heavy-duty bit utilizes an energy-efficient 2-cutter head geometry that provides up to 2X more drilled holes per battery charge while doubling overall tool service life. The system integrates an aggressive, low-thread-count pilot screw that pulls the cutter through framing timbers effortlessly to resist sticky pitch accumulation, anchored safely by a robust 7/16-inch quick-change hex shank that requires a 1/2-inch chuck to completely eliminate high-torque slippage during demanding plumbing and electrical rough-in setups.

Best Used For:

  • Conduit Rough-In Routing: Sinking clean 1-1/8 inch circular holes through dimensional wall studs for commercial electrical conduit paths.
  • Plumbing Pipe Runs: Boring precise structural pass-through tracks through structural floor joists to install clean water lines and copper drains.
  • Solo Heavy Construction Boring: Operating cordless drills at lower mechanical resistance to drill repetitive timber cavities solo without overtaxing battery packs.

Key Performance & Safety Features

  • 2-Cutter Head Balance: Reduced mechanical footprint minimizes rotational resistance to secure up to 2X more holes per battery charge cycle.
  • Heat Forged Steel Structure: Precision automated thermal forming delivers optimal mechanical integrity and structural wear durability.
  • Anti-Loss Pull-Out Stop: Integrated mechanical block retention keeps the self-feed lead screw from slipping out during tool withdrawal.
  • Low-Thread Pilot Screw: Deep pitch threading pulls the tool continuously through soft woods while resisting binding sawdust compression.
  • 7/16 Inch Non-Slip Hex Shank: Multi-flat drive face anchors tightly inside heavy-duty drill chucks to ensure continuous rotational force delivery.

What's Included

  • (1) Diablo 1-1/8" SPEEDemon™ Self-Feed Bit (DSF1125)
  • (1) Replacement Feed Screw
  • (1) Allen Key

Technical Specifications

Brand Name Diablo Tools
Model Number DSF1125
Product Collection SPEEDemon™ Series
Tool Classification Self-Feed Drill Bit
Cutter Diameter Profile 1.125 in. (1-1/8 in.)
Overall Tool Length 5.125 in. (5-1/8 in.)
Shank Size Dimension 0.4375 in. (7/16 in.) Hex Shank
Chuck Port Requirement 0.50 in. (1/2 in.) Drill Chuck Minimum
Feed Configuration Type Low-Thread Threaded Self-Feed Screw
Cutter Head Architecture Balanced 2-Cutter Layout
Bit Core Metallurgy Precision Heat-Forged High Speed Steel
Material Applications Soft Wood framing, Clean Structural Wood
Pack Quantity 1 Bit Kit

Pro-Tip: When boring through dense wood knots or multi-ply layers, let the threaded screw lead pull the bit at a constant pace without pressing down hard on the tool body. This reduces frictional heat on the main high-speed steel perimeter blades and preserves battery life across long rough-in jobs.