Irwin 304600 Series 1-1/8" 3-Cutter Self-Feed Wood Boring Drill Bit, High Carbon Steel

Irwin 304600 Series 1-1/8" 3-Cutter Self-Feed Wood Boring Drill Bit, High Carbon Steel

The Irwin 304600 Series is a family of 1-1/8" 3-cutter self-feed drill bits engineered for electricians, plumbers, and contractors who need fast, clean, large-diameter holes through framing and joists. Offered as Models 3046005, 3046008, and 3046009, every bit in the series is forged in one piece from high carbon steel and fitted with a 7/16" hex quick-change impact shank that fits 1/2" or larger drills as well as 7/16" hex impact wrench drills. With three times the cutting area and edges of a standard Irwin self-feed bit, the 304600 Series drills faster and lasts longer, making it ideal for large-diameter holes in wood for pipe and conduit systems.

Key Features

• Trade Size: 1-1/8" diameter self-feed bit for drilling large-diameter holes in wood, shared across the 304600 Series.
• Durable Construction: Forged in one piece from high carbon steel for maximum strength under tough drilling conditions.
• 3X Cutting Edges: Delivers three times the cutting area and edges of standard self-feed bits, extending bit life.
• Quick-Change Shank: 7/16" hex quick-change impact shank fits 1/2" or larger drills and 7/16" hex impact wrench drills.
• Aggressive Screw Pitch: Pulls the bit through material quickly for faster, more efficient drilling.
• Precision Milled Shank: Eliminates run-out and wobble for accurate, true-running holes.
• Ideal for Pipe & Conduit Systems: Sized and built for drilling clearance holes for pipe and conduit runs through wood framing.
• Carded Packaging: Individually carded for easy identification and retail display.

Technical Specifications

• Warranty: NLW
• Claims Needed: No
• Country of Origin: China
• Battery Included: No
• Power Source: NON-ENERGY USING

Typical Applications

• Drilling Large-Diameter Holes in Wood
• Pipe and Conduit Installation Systems
• Electrical Wiring Rough-In Through Framing
• Plumbing and HVAC Rough-In
• Residential and Commercial Construction
• New Construction and Renovation Projects

Why Irwin?

Irwin builds every bit in the 304600 Series as a single forged piece of high carbon steel, giving it the strength to stand up to repeated use under demanding drilling conditions. The precision milled 7/16" hex quick-change shank keeps each bit running true and eliminates run-out and wobble, while the aggressive screw pitch and 3X cutting edges keep jobs moving on site. Backed by Irwin's reputation for professional-grade cutting tools, the 304600 Series is built to perform reliably shift after shift, making it a dependable choice for contractors and tradespeople who need consistent, large-diameter holes in wood for pipe, conduit, and cable runs.