10239 Unibit Step Drill Bit, #9, 7/8 & 1-1/8-In. Holes

The Irwin 10239 Unibit Step Drill Bit #9 is a specialized cutting tool designed to drill two hole sizes—7/8-inch and 1-1/8-inch—in a single bit. This step drill bit works on both ferrous and non-ferrous materials, making it a versatile addition to any workshop.

The single-flute cutting edge provides superior control through each step, ensuring true, round holes. The SpeedPoint tip penetrates faster and helps prevent walking across the work surface, particularly useful when drilling into thin materials such as stainless steel, copper, brass, aluminum, plastic, and laminates. The hex shank prevents slipping in the drill chuck for secure bit retention.

Features and Benefits

• Single-Flute Cutting Edge: Provides enhanced control through each step and helps prevent bit walking.
• SpeedPoint Tip: Penetrates fast and helps prevent walking in thin material applications.
• Hex Shank Design: Prevents slipping in drill chuck for secure bit retention.
• High-Speed Steel Construction: Robust HSS material tolerates high RPMs without losing edge sharpness.
• Dual Hole Sizes: Drills both 7/8-inch and 1-1/8-inch holes in one bit.
• Versatile Material Compatibility: Works on ferrous and non-ferrous substrates.

Specifications

• Brand: Irwin
• Model: 10239
• Size: #9 Unibit
• Hole Diameters: 7/8-inch and 1-1/8-inch
• Shank Diameter: 1/2-inch hex shank
• Material: High-speed steel (HSS)
• Flute Type: Single flute
• Tip Style: SpeedPoint