Enhance your drilling toolkit with the Irwin Unibit #3 Step Drill Bit—an all-in-one solution that cuts precise, clean holes from 1/4" up to 3/4" without changing bits. Crafted from industrial-grade high-speed molybdenum steel and featuring laser-etched step markings, this versatile bit glides through steel, aluminum, brass, copper and more. Whether you’re a professional tradesperson or a weekend DIYer, you’ll appreciate the accuracy and ease delivered by its SpeedPoint tip and single-concave flute design.

Built for durability and control, the 3/8" hex shank ensures a secure grip in your drill chuck, while the concave flute geometry produces true round holes with minimal burr. From electrical panels to sheet-metal fabrication, the Irwin Unibit #3 minimizes bit changes and maximizes productivity on every job.

Key Features

• Single-Concave Flute Design for perfectly round holes and efficient chip evacuation
• SpeedPoint Tip to prevent “walking” and deliver fast, accurate starts
• 9 Steps Laser-Etched from 1/4" to 3/4" in 1/16" increments for on-the-fly size selection
• Industrial-Grade High-Speed Molybdenum Steel for extended bit life
• 3/8" Hex Shank for slip-resistant engagement and quick bit changes

⚠️ WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.