The greaseable RH10 drill head offers responsive steer on command for precise installations. This RH10 is configurated for D40x55DR S3r with Starter rod connection to reduce length for ease of tool handling. Compatible with minimum 5.5-in (14-cm) cut diameter tri cone and PDC bits on a 2.875-in API thread. Compatible with DCI 15-in (38.1-cm) sonde.