The Vermeer 12″ (30.5 cm) Mix Master reamer puts it all together for your horizontal directional drilling job. ✔3.5″ (8.9 cm) API reg box x pin. ✔Aggressive cutting and mixing design characteristics help reduce pullback and rotational forces required from the directional drill rig. ✔Carbide shark teeth tooling supplies effective shearing action. ✔Ideal HDD tooling for sandy loam, sticky clay and other reactive ground conditions.