This tangential flow impeller is effective for low speed, high viscosity mixing. The 2 x 2 inch (50 mm x 50 mm) ­anchor blade is welded to an 5/16 inch (8 mm) diameter shaft, all electropolished 316L stainless steel. Sometimes referred to as a “sweep”, the high shear at the edges makes it a good choice to use close to the vessel wall.