Brand New Southwest Speed 6-Blade Aluminum Racing Fan,15 Inch, Black (Part #410-425). Southwest Speed 6-blade fans are heavy-duty to move volumes of air and keep your race engine cool. These "engine coolers" are aluminum with a protective black finish and have a universal bolt pattern and a 5/8 in. pilot hole. Race engines need to be cooled to run better, because they get hot! This 6-blade fan will keep your hot car cooled! Features: Six blade non-flex fan blade design maximizes airflow for the best cooling The solid fan blades will not flatten out like a flex fan at high RPM Recommended for race applications such as Modified, Sport Mod, Late Model, Stock Car, Hobby Stock, etc. Slotted bolt pattern to fit nearly all V8 standard rotation water pumps Black powder coated finish offers a long lasting durable finish Specs: Fan Diameter: 15 Inch Fan Flow Type: Pull Rotation: Clockwise/Standard Material: Aluminum Finish: Black Powder Coated