316 SS. The axial flow turbine is a classic medium shear impeller. Very effective in both low viscosity and high, this radial flow turbine allows a mixer to the break up agglomeration and impart solids effectively. They will draw more power per volume than the propellers or hydrofoils as motor power is converted to shear energy. Mixer Direct's Lab Axial Flow Turbine features a 2.5" blade, a 3/8 bore, and a hub with set screw attachment for easy blade installment.