Product info

Robit® Overburden Eccentric System

  • Designed to offer maximum reliability in overburden drilling conditions
  • Enables driving the casing in all downward vertical directions/formations
  • Helps avoid collapsing holes and lost equipment
  • A two-piece bit, consisting of a concentric pilot bit and a swing-out eccentric reamer
  • Enlarges the hole’s diameter driving the casing down into the hole
  • Reamer can be retractred by applying reverse rotation
  • Full system can be pulled out and used again
  • Ideal for water well and geothermal drilling, micropiling, as well as dam and port projects
Casing OD (mm)273,0
Casing OD (in.)10 ¾
Casing Max Wall (mm)6,3
Casing Max Wall (in.)0.248
Casing ID (mm)260,4
Casing ID (in.)10.251
Pilot bit (mm)255,0
Pilot bit (in.)10.039
Reamed diam. (mm)307,0
Reamed diam. (in.)12.086
Drill pipes (mm)139 / 168
Drill pipes (in.)5½ / 6½