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Irwin Tools IRWIN Unibit #21 13/16-Inch to 1-3/8-Inch Step-Drill Bit, 1/2-Inch Shank (10221), Black
Irwin Tools IRWIN Unibit #21 13/16-Inch to 1-3/8-Inch Step-Drill Bit, 1/2-Inch Shank (10221), Black
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New SpeedPoint tip provides 6X faster initial penetration time than before, and eliminates the need for center punching. Single-fluted cutting edge assures true round holes, and allows greater control with less vibration. Id...

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Product Review

New SpeedPoint tip provides 6X faster initial penetration time than before, and eliminates the need for center punching. Single-fluted cutting edge assures true round holes, and allows greater control with less vibration. Ideal for drilling holes in thin materials such as mild steel, copper, brass, aluminum, Plexiglas, wood, and laminates. Coating: Black Oxide Materials: Steel Drill Bit Range Max: 1 3/8quot; Drill Bit Range Min: 13/16quot;.

  • Step drill #21: 13/16-inch to 1-3/8-inch capacity, 10 size options
  • Shank type: 3-Flat, 1/2-inch diameter, prevents slipping in drill chuck
  • Cutting edge: Single-flute design, ensures true round hole in thin materials
  • Material compatibility: Ideal for drilling holes in metal, plastic, and laminates
  • Hole enlarging: Suitable for 13/16-inch to 1-3/8-inch diameter holes in thin materials

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