Use SD-3 Counterbores to drill a pilot hole and counterbore a flat bottomed hole in one step. Perfect for lag screws, lag bolts, washer head screws, T-nuts & more.

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Use SD-3 Counterbores to drill a pilot hole and counterbore a flat bottomed hole in one step. Perfect for lag screws, lag bolts, washer head screws, T-nuts & more.

  • Drive Shank: 1/4 Inch Hex Power Bit Shank
  • Drill Size: 1/8 Inch
  • Counterbore Size: 1/2 Inch
  • Drive Shank: 1/4 Inch Hex Power Bit Shank
  • Drill Size: 1/8 Inch
  • Counterbore Size: 1/2 Inch

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