The M2
| Hook | Dry type, 14 to 18 |
| Thread | Yellow |
| Tails | Hare's mask hairs dyed in yellow |
| Body | Thread dirty yellow-orange |
| Hackle | Dark red coch hackle |
| Wings | Two cock hackle feathers dyed |
| Creator | Marcel Langhendries |
| Use | BWO imitation. A pretty good hatch fly. |