The Vermeer 18″ (45.7 cm) diamond wing cutter reamer helps you be more efficient and effective on your horizontal directional drilling job. ✔2.875″ (7.3 cm) API box x pin. ✔Dual-tapered, open-bodied design maintains mixing action with reduced pullback and rotational forces required from the directional drill rig. ✔Front- and rear-facing Shark Teeth ease needed pushback and handle your HDD job coming and going. ✔Ideal HDD tooling for sandy soil loam, soft soil and medium soil.