All ROTO-BORE BITS are machined from solid chrome-moly steel bar stock on state-of-the-art CNC lathes and machining centers. All bits are quenched and tempered to an average tensile strength of 153,000 psi for optimum strength and toughness.

The bit's screw thread is much heavier than most competitors' designs. This heavy-duty design assures contractors a long service life and lowers operating costs.