Step Drill Bit - Fractional/Self-Starting 9 Holes 1/4 - 3/4 In - Unibit

The Unibit UN3 Step Drill Bit is engineered for automotive and industrial professionals who require precise and efficient hole drilling. This self-starting, fractional drill bit consolidates nine common hole sizes from 1/4" to 3/4" onto a single, durable tool, streamlining operations and reducing the need for frequent bit changes.

Key Features

• Self-Starting Tip: The precisely ground tip eliminates the need for pre-drilling or center punching, ensuring immediate, secure starts on various surfaces, including curved or uneven materials.
• Single-Flute Design: Engineered to produce true, round holes with minimized burring, this feature enhances control during operation and delivers a clean finish suitable for professional applications.
• Industrial-Grade Molybdenum Steel Construction: Manufactured from high-speed molybdenum steel and heat-treated for superior hardness and wear resistance, ensuring extended service life in demanding industrial and automotive environments.
• Integrated Fractional Sizing: Combines nine essential fractional hole sizes (1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4") into one bit, optimizing toolkit organization and reducing time spent searching for specific drill bits.
• 3-Flatted Shank: Designed to provide a robust, non-slip grip within the drill chuck, maintaining consistent drilling performance and preventing slippage under heavy loads.

Applications

The Unibit UN3 Step Drill Bit is well-suited for drilling clean, accurately sized holes in common automotive and industrial materials such as sheet metal, plastics, and thin-gauge materials up to 1/8" thick. It is an essential tool for tasks including electrical installations, automotive body panel work, custom fabrication projects, and general maintenance where consistent, precise holes are critical. Step drill bits are particularly useful for creating or enlarging holes in electrical enclosures and chassis holes, as they create clean holes without jagged edges and minimize the risk of deforming or bending the metal.

Specifications

• Hole Sizes: 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4"
• Shank Size: 3/8"
• Maximum Material Thickness: 1/8"
• Material: Industrial-grade High-Speed Molybdenum Steel