| Collet Series | A | B |
|---|---|---|
| ER8 | 8.5mm (.335in) | 13.5mm (.531in) |
| ER11 | 11.5mm (.453in) | 18mm (.709in) |
| ER16 | 17mm (.669in) | 27.5mm (1.063in) |
| ER20 | 21mm (.827in) | 31.5mm (1.220in) |
| ER25 | 26mm (1.024in) | 34mm (1.378in) |
| ER32 | 33mm (1.299in) | 40mm (1.575in) |
| ER40 | 41mm (1.614in) | 46mm (1.811in) |
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