A hand reamer has a longer taper or lead in at the front than a machine reamer. This is to compensate for the difficulty of starting a hole by hand power alone. It also allows the reamer to start straight and reduce the risk of breakage. The flutes may be straight or spiral. Each machine requires a different type and size of reamer. The depth of the hole or surface being also drilled determines the length of the reamer to choose.
MM SIZE
| Dia (mm) | CEL | OVL |
| 3 | 31 | 62 |
| 3.5 | 35 | 71 |
| 4 | 38 | 76 |
| 4.5 | 41 | 81 |
| 5 | 44 | 87 |
| 5.5 | 47 | 93 |
| 6 | 47 | 93 |
| 6.5 | 50 | 100 |
| 7 | 54 | 107 |
| 8 | 58 | 115 |
| 9 | 62 | 124 |
| 10 | 66 | 133 |
| 11 | 71 | 142 |
| 12 | 76 | 152 |
| 13 | 76 | 152 |
| 14 | 81 | 163 |
| 15 | 81 | 163 |
| 16 | 87 | 175 |
| 17 | 87 | 175 |
| 18 | 93 | 188 |
| 19 | 93 | 188 |
| 20 | 100 | 201 |
| 21 | 100 | 201 |
| 22 | 107 | 215 |
| 23 | 107 | 215 |
| 24 | 115 | 231 |
| 25 | 115 | 231 |
| 26 | 115 | 231 |
| 27 | 124 | 247 |
| 28 | 124 | 247 |
| 29 | 124 | 247 |
| 30 | 124 | 247 |
| 31 | 124 | 247 |
| 32 | 133 | 265 |
| 33 | 133 | 265 |
| 34 | 142 | 284 |
| 35 | 142 | 284 |
| 36 | 142 | 284 |
| 37 | 142 | 284 |
| 38 | 152 | 305 |
| 39 | 152 | 305 |
| 40 | 152 | 305 |
| 41 | 152 | 305 |
| 42 | 152 | 305 |
| 43 | 152 | 305 |
| 44 | 163 | 326 |
| 45 | 163 | 326 |
| 46 | 163 | 326 |
| 47 | 163 | 326 |
| 48 | 174 | 347 |
| 49 | 174 | 347 |
| 50 | 174 | 347 |
| 51 | 174 | 347 |
| 52 | 174 | 347 |
| 53 | 174 | 347 |
| 54 | 174 | 347 |
| 55 | 184 | 367 |
| 56 | 184 | 367 |
| 57 | 184 | 367 |
| 58 | 184 | 367 |
| 59 | 184 | 367 |
| 60 | 184 | 367 |
| 61 | 184 | 367 |
| 62 | 194 | 387 |
| 63 | 194 | 387 |
| 64 | 194 | 387 |
| 65 | 194 | 387 |
| 67 | 194 | 387 |
| 71 | 203 | 406 |
INCH SIZE
| DIA (Inch) | CEL | OVL |
| 1/8 | 1.5/16 | 2.5/8 |
| 5/32 | 1.1/2 | 3 |
| 3/16 | 1.3/4 | 3.7/16 |
| 7/32 | 1.7/8 | 3.11/16 |
| 1/4 | 2 | 3.15/16 |
| 9/32 | 2.1/8 | 4.3/16 |
| 5/16 | 2.1/4 | 4.1/2 |
| 11/32 | 2.7/16 | 4.7/8 |
| 3/8 | 2.5/8 | 5.1/4 |
| 13/32 | 2.5/8 | 5.1/4 |
| 7/16 | 2.13/16 | 5.5/8 |
| 15/32 | 3 | 6 |
| 1/2 | 3 | 6 |
| 17/32,9/16 | 3.3/16 | 6.7/16 |
| 19/32,5/8 | 3.7/16 | 6.7/8 |
| 21/32,11/16 | 3.11/16 | 7.7/16 |
| 23/32,3/4 | 3.15/16 | 7.15/16 |
| 13/16 | 3.15/16 | 7.15/16 |
| 7/8 | 4.3/16 | 8.1/2 |
| 15/16 | 4.1/2 | 9.1/16 |
| 1 | 4.1/2 | 9.1/16 |
| 1.1/16,1.1/8 | 4.7/8 | 9.3/4 |
| 1.3/16 | 5.1/4 | 10.7/16 |
| 1.1/4 | 5.1/4 | 10.7/16 |
| 1.5/16 | 5.1/4 | 10.7/16 |
| 1.3/8,1.7/16 | 5.5/8 | 11.3/16 |
| 1.1/2 | 6 | 12 |
| 1.9/16 | 6 | 12 |
| 1.5/8 | 6 | 12 |
| 1.3/4 | 6.7/16 | 12.13/16 |
| 1.7/8 | 6.7/8 | 13.11/16 |
| 2 | 6.7/8 | 13.11/16 |
| 2.1/16 | 6.7/8 | 13.11/16 |
| 2.1/8 | 7.1/4 | 14.7/16 |
| 2.3/16 | 7.1/4 | 14.7/16 |
| 2.1/4 | 7.1/4 | 14.7/16 |
| 2.5/16 | 7.1/4 | 14.7/16 |
| 2.3/8 | 7.5/8 | 15.1/4 |
| 2.7/16 | 7.5/8 | 15.1/4 |
| 2.1/2 | 7.5/8 | 15.1/4 |