Stir shaft with PTFE four blade screw propeller, 10 mm O. D. x 400 mm length PTFE covered stainless steel shaft, 50 mm O. D. propeller with 22 mm high blades. Comes with 10 mm O. D., steel reinforced shaft. The end of the shaft has 50 mm of steel shaft exposed at one end for better chuck grip. Pitch angle is 45°. High tolerance PTFE-coated stainless steel stirrer shaft allow for higher stirring speeds with Trubore bearings. 500 RPM max speed if used unlubricated.