Moore & Wright Micrometer Heads.
| MW310-15 | MW310-25 | |
| Dimn - A | 9.5mm | 12mm |
| Dimn - B | 9.5mm | 16mm |
| Dimn - C | 26mm | 46mm |
| Dimn - D | 5mm | 6.5mm |
| Dimn - E | 61mm | 115mm |
| Dimn - F | 13.5mm | 18mm |
Models 521, 522:
| MW310-15 | Flat Anvil | 0-15 | 0.01 | POA |
| MW310-25 | Flat anvil | 0-25 | 0.01 | POA |