BZ Fixed Diameters hole openers are made of tough treaded allow steel for maximum strength. Cutter arms are hard faced and welded on body, equipped with removable cutters. Cutters are available in three types.
- Type SM is for soft to medium formations.
- Type MH for medium to hard formation
- Type XH for hard formation.
The hope openers have three or six jet tubes with replaceable nozzles, so that jets streams quickly clean the enlarged hole