12" Aircraft Extension Bit
Flute length is the same as a standard Jobber bit. Single piece construction. Spring tempered shanks prevent permanent bending when drilling holes not in direct alignment.
| Size | Decimal Equivalent | Flute Length (IN) | Overall Length (IN) |
| 1 | 0.228 | 2-5/8 | 12 |
| 2 | 0.221 | 2-5/8 | 12 |
| 3 | 0.213 | 2-1/2 | 12 |
| 4 | 0.209 | 2-1/2 | 12 |
| 5 | 0.2055 | 2-1/2 | 12 |
| 6 | 0.204 | 2-1/2 | 12 |
| 7 | 0.201 | 2-7/16 | 12 |
| 8 | 0.199 | 2-7/16 | 12 |
| 9 | 0.196 | 2-7/16 | 12 |
| 10 | 0.1935 | 2-7/16 | 12 |
| 11 | 0.191 | 2-5/16 | 12 |
| 12 | 0.189 | 2-5/16 | 12 |
| 13 | 0.185 | 2-5/16 | 12 |
| 14 | 0.182 | 2-3/16 | 12 |
| 15 | 0.18 | 2-3/16 | 12 |
| 16 | 0.177 | 2-3/16 | 12 |
| 17 | 0.173 | 2-3/16 | 12 |
| 18 | 0.1695 | 2-1/8 | 12 |
| 19 | 0.166 | 2-1/8 | 12 |
| 20 | 0.161 | 2-1/8 | 12 |
| 21 | 0.159 | 2-1/8 | 12 |
| 22 | 0.157 | 2 | 12 |
| 23 | 0.154 | 2 | 12 |
| 24 | 0.152 | 2 | 12 |
| 25 | 0.1495 | 1-7/8 | 12 |
| 26 | 0.147 | 1-7/8 | 12 |
| 27 | 0.144 | 1-7/8 | 12 |
| 28 | 0.1405 | 1-3/4 | 12 |
| 29 | 0.136 | 1-3/4 | 12 |
| 30 | 0.1285 | 1-5/8 | 12 |
| 31 | 0.12 | 1-5/8 | 12 |
| 32 | 0.116 | 1-5/8 | 12 |
| 33 | 0.113 | 1-1/2 | 12 |
| 34 | 0.111 | 1-1/2 | 12 |
| 35 | 0.11 | 1-1/2 | 12 |
| 36 | 0.1065 | 1-7/16 | 12 |
| 37 | 0.104 | 1-7/16 | 12 |
| 38 | 0.1015 | 1-7/16 | 12 |
| 39 | 0.0995 | 1-3/8 | 12 |
| 40 | 0.098 | 1-3/8 | 12 |
| 41 | 0.096 | 1-3/8 | 12 |
| 42 | 0.0935 | 1-1/4 | 12 |
| 43 | 0.089 | 1-1/4 | 12 |
| 44 | 0.086 | 1-1/8 | 12 |
| 45 | 0.82 | 1-1/8 | 12 |
| 46 | 0.081 | 1-1/8 | 12 |
| 47 | 0.0785 | 1 | 12 |
| 48 | 0.076 | 1 | 12 |
| 49 | 0.073 | 1 | 12 |
| 50 | 0.07 | 1 | 12 |
| 51 | 0.067 | 1 | 12 |
| 52 | 0.0635 | 7/8 | 12 |
| 53 | 0.0553 | 7/8 | 12 |
| 54 | 0.055 | 7/8 | 12 |
| 55 | 0.052 | 7/8 | 12 |
| 56 | 0.0465 | 3/4 | 12 |
| 57 | 0.043 | 3/4 | 12 |
| 58 | 0.042 | 11/16 | 12 |
| 59 | 0.041 | 11/16 | 12 |
| 60 | 0.04 | 11/16 | 12 |
| 3/64 | 0.0469 | 3/4 | 12 |
| 1/16 | 0.0625 | 7/8 | 12 |
| 5/64 | 0.0781 | 1 | 12 |
| 1/8 | 0.125 | 1-5/8 | 12 |
| 3/32 | 0.0938 | 1-1/4 | 12 |
| 7/64 | 0.1094 | 1-1/2 | 12 |
| 9/64 | 0.1406 | 1-3/4 | 12 |
| 5/32 | 0.1562 | 2 | 12 |
| 11/64 | 0.1719 | 2-1/8 | 12 |
| 3/16 | 0.1875 | 2-5/16 | 12 |
| 13/64 | 0.2031 | 2-7/16 | 12 |
| 7/32 | 0.2188 | 2-1/2 | 12 |
| 15/64 | 0.2344 | 2-5/8 | 12 |
| 1/4 | 0.25 | 2-3/4 | 12 |
| 17/64 | 0.2656 | 2-7/8 | 12 |
| 9/32 | 0.2812 | 2-15/16 | 12 |
| 19/64 | 0.2969 | 3-1/16 | 12 |
| 5/16 | 0.3125 | 3-3/16 | 12 |
| 21/64 | 0.3281 | 3-5/16 | 12 |
| 11/32 | 0.3438 | 3-7/16 | 12 |
| 23/64 | 0.3594 | 3-1/2 | 12 |
| 3/8 | 0.375 | 3-5/8 | 12 |
| 25/64 | 0.3906 | 3-3/4 | 12 |
| 13/32 | 0.4062 | 3-7/8 | 12 |
| 27/64 | 0.4219 | 3-15/16 | 12 |
| 7/16 | 0.4375 | 4-1/16 | 12 |
| 29/64 | 0.4531 | 4-3/16 | 12 |
| 15/32 | 0.4688 | 4-5/16 | 12 |
| 31/64 | 0.4844 | 4-3/8 | 12 |
| 1/2 | 0.5 | 4-1/2 | 12 |
| Size. | Decimal equivalent | Flute Length | Overall length |
|---|---|---|---|
| 17/32 | .5312 | 9 | 12 |
| 9/16 | .5625 | 9 | 12 |
| 5/8 | .6250 | 9 | 12 |
| 3/4 | .7500 | 9 | 12 |
| 7/8 | .8750 | 9 | 12 |
| 1 | 1.0000 | 9 | 12 |