Each blade is clearly labeled as to pitch, diameter, rotation and maximum rpm.
Blades are made of high strength aluminum.Lau can be used with well known manufacturer's including ge, rheem-rudd, singer-climate control, trane and more. 2 Blade Fixed Hub Propeller - 18" Diameter Ccw,I Rotation Features steel fixed hub with 1/2" bore. Includes top quality, epoxy painted spiders with high salt spray characteristics.