Mills Machine has been manufacturing Split Bit Type Roller Cone Hole Openers for over 45 years. These ruggedly constructed, high-quality units are made from 4142 heat-treated alloy steel and split roller rock bit cutters. Each hole opener is custom manufactured for your specific application.

Sizes Range from 5 1/2" to 118"

One, Two, or Multiple Stage Designs

Regular or Reverse and Air or Fluid Circulation as shown at left

Any Thread or Flange Size

Steel Tooth or TCI Button in New, Retip, or Rerun Condition

Sofft, Medium, or Hard Formation Cutters

Extended Top or Bottom Neck with Flats

Fabricated Fixed Cutter or Bolt-on Cutter Design

Blade and Bullet Cutter Designs are available.