This impeller serves a wide range of stirring applications, pairing the blade and shaft in a convenient package. This axial flow impeller is effective for high speed, low to medium viscosity mixing. The 2-1/2 in. (65 mm) diameter blade fixes to an sup>5/16 in. (8 mm) diameter shaft with included set screws. Blade and shaft are electro polished 316L stainless steel. For low shear, high top to bottom pumping capacity with high gas injection, able to vortex 19 L (5 gal. ) of water at 3600 rpm. Specifications: Flow pattern: Axial Blade diameter: 2-1/2 in. (64 mm) Shaft length: 16 in. (400 mm) Shaft diameter: 5/16 in. (8 mm) Weight: 0. 4 lb. (181 g)