Stirring Shaft, 19mm, Polished, Button Style, for 12000mL to 22000mL Flasks, 725mm OAL. A 19mm precision ground and polished stirrer shaft to fit CG-2086 19mm PTFE bearings. Side button for attachment of CG-2089 PTFE stirrer blades.PLEASE NOTE: THESE SHAFTS ARE NOT TO BE USED WITH ANY TYPE OF GLASS BEARING. FOR GROUND SHAFTS USED WITH GLASS BEARINGS SEE CG-2085.ALSO NOTE: 19MM SHAFTS HAVE A REDUCED DIAMETER TOP SECTION THAT IS 1/2"OD, PLEASE KEEP THIS IN MIND WHEN SELECTING THE PROPER SIZE COUPLING.