The BICO Vari-Bore II Hole Opener* is a new and unique tool built for horizontal directional drilling. The Vari-Bore II Hole Opener combines the strength and reliability of oilfield hole openers with the versatility of hole openers with threaded cutters. Additionally, the Vari-Bore II Hole Opener has superior cutting action versus split bit hole openers while having comparable operating costs.

  1. Three to five agitators reduce hole packing.
  2. Hard-facing reduces wear and maintenance costs.
  3. Six to ten strategically placed fluid nozzles promote hole and cutter cleaning.
  4. Sealed, pressure compensated roller bearing cutters available in tungsten carbide insert (TCI) or milled tooth.
  5. Cutters are supported on both ends, unlike other adjustable hole openers, reducing chance of losing cutters in hole or damaging body.

* Patent Pending

Standard Size Vari-Bore™ II Hole Openers
(Special sizes & threads available on request)
Tool Series Hole Opening Range (in) Number of Minimum Pilot (in) Cutters Body OD (in) Threads Box x Box
V4B 8-1/2 - 12 4-1/4 3 3-1/2 2-3/8" IF
V6B 12 - 16 6-1/4 3 4-3/4 3-1/2" IF
V8B 16 - 26 8-1/2 3 6-1/2 4-1/2" IF
V17B 24 - 34 17-1/2 3 9-1/2 7-5/8" REG
V26B 32 - 42 26 3 9-1/2 7-5/8" REG
V36B 42 - 52 36 4 9-1/2 7-5/8" REG
V42B 48 - 58 42 4 9-1/2 7-5/8" REG
V48B 54 -64 48 5 9-1/2 7-5/8" REG