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.

Buy Now From Amazon

Product Review

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: 5/16 Inch
  • Counterbore Size: 3/4 Inch

Similar Products

Snappy Flat Bottom Counterbore Countersink 1/4 in. Drill Bit x 5/8 Bore USA MADESnappy Flat Bottom Counterbore Countersink 1/4 in. Drill Bit x 3/4 Bore USA MADEGRR-RIPPER 3D Pushblock for Table Saws, Router Tables, Band Saws, and Jointers by MICROJIG