Diamond section is by far the most popular choice
of scroll rod. It is heavy and has remarkable strength which gives
excellent resistance to thrust and torque loading. Clearance of
cuttings is most efficient, aiding fast drilling and achieving very
smooth holes. Diamond sections are available solid or hollow.
Turbine section is suited to abrasive drilling conditions. The flat edged wing offers a larger surface area to the wall of the hole, which results in effective wear resistance. Turbine sections are also available solid or hollow.