The Vermeer 14-in (35.6-cm) Mix Master reamer puts it all together for your horizontal directional drilling job. 3.5-in (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.