| Size | Body Diameter (A) | Drill Diameter (D) | Drill Length (C) | OAL (L) |
| 00 | 1/8" | 0.025" | 0.030" | 1-1/8" |
| 0 | 1/8" | 0.031" | 0.038" | 1-1/8" |
| 1 | 1/8" | 0.046" | 3/64" | 1-1/4" |
| 2 | 3/16" | 0.078" | 5/64" | 1-7/8" |
| 3 | 1/4" | 0.109" | 7/64" | 2" |
| 4 | 5/16" | 0.125" | 1/8" | 2-1/8" |
| 5 | 7/16" | 0.187" | 3/16" | 2-3/4" |
| 6 | 1/2" | 0.218" | 7/32" | 3" |
| 7 | 5/8" | 0.250" | 1/4" | 3-1/4" |
| 8 | 3/4" | 0.312" | 5/16" | 3-1/2" |
| Size | Body Diameter (A) | Drill Diameter (D) | Bell Dia. (E) | Drill Length (C) | OAL (L) |
| 11 | 1/8" | 0.046" | 0.10" | 3/64" | 1-1/4" |
| 12 | 3/16" | 0.062" | 0.15" | 1/16" | 1-7/8" |
| 13 | 1/4" | 0.093" | 0.20" | 3/32" | 2" |
| 14 | 5/16" | 0.109" | 0.25" | 7/64" | 2-1/8 |
| 15 | 7/16" | 0.156" | 0.35" | 5/32" | 2-3/4 |
| 16 | 1/2" | 0.187" | 0.40" | 3/16" | 3" |
| 17 | 5/8" | 0.218" | 0.50" | 7/32" | 3-1/4" |
| 18 | 3/4" | 0.250" | 0.60" | 1/4" | 3-1/2" |
From size 00 to size 8, find the right center drill for spotting and centerdrilling operations.
Make the hole
The right drill geometry keeps the hole round, on size, and on center. Solid carbide drills, ground and stocked in Michigan.