With the blade welded to the shaft, this impeller is immediately ready to use with the 1540 Crossover and start mixing. No tightening or adjusting set screws is needed, and the one piece impeller is desirable for pharmaceutical, food and other sanitary applications. The three-blade square pitch propeller is 6 inch (152 mm) diameter, composed of 316L stainless steel. Blade is cast, then polished and buffed to a mirror surface finish type #4. The ½ inch (13 mm) diameter shaft is constructed of ground and polished 316 stainless steel for enhanced corrosion protection, 36 inch (914 mm) length.