34820 – 5/16″ x 3/4″ 3-Flute Flat Bottom Counterbore with TiN coated twist drill
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″ Hex Power Bit Shank
- Drill Size: 5/16″ Ø
- Counterbore Size: 3/4″ Ø