Hard Wood Soft Wood
| Screw Size | Tapered Bit | Straight Bit | Tapered Bit | Straight Bit | Countersink Size |
| #2 | 3/32″ | 1/16″ | 5/64″ | 1/16″ | 1/4″ |
| #3 | 7/64″ | 5/64″ | 3/32″ | 1/16″ | 1/4″ |
| #4 | 7/64″ | 5/64″ | 3/32″ | 1/16″ | 1/4″ |
| #5 | 1/8″ | 3/32″ | 7/64″ | 5/64″ | 5/16″ |
| #6 | 9/64″ | 7/64″ | 1/8″ | 3/32″ | 5/16″ |
| #7 | 5/32″ | 7/64″ | 9/64″ | 3/32″ | 5/16″ |
| #8 | 11/64″ | 1/8″ | 5/32″ | 7/64″ | 3/8″ |
| #9 | 3/16″ | 9/64″ | 11/64″ | 1/8″ | 3/8″ |
| #10 | 13/64″ | 9/64″ | 3/16″ | 1/8″ | 7/16″ |
| #12 | 7/32″ | 5/32″ | 13/64″ | 9/64″ | 7/16″ |
| #14 | 1/4″ | 11/64″ | 15/64″ | 5/32″ | 1/2″ |
| #16 | 9/32″ | 3/16″ | 17/64″ | 11/64″ | 9/16″ |
| #18 | 5/16″ | 7/32″ | 19/64″ | 13/64″ | 5/8″ |
| #20 | 21/64″ | 15/64″ | 5/16″ | 7/32″ | 3/4″ |
| #24 | 3/8″ | 17/64″ | 3/8″ | 1/4″ | 3/4″ |