The Vermeer 20″ (50.8 cm) fly cutter reamer is a robust flat-face reamer designed for higher-horsepower directional drill rigs. ✔3.5″ (8.9 cm) API reg box x pin. ✔Kennametal C20 pockets and replaceable C21HD rotary teeth supply long-lasting cutting performance for horizontal directional drilling. ✔Changeable carbide fluid nozzles optimize flow including front and rear fluid nozzles to increase spoil displacement. ✔Ideal HDD tooling for a variety of ground conditions.