The Allstar Performance Steel Fan is an 18-inch, 4-blade mechanical cooling fan with a universal bolt pattern and a 5/8-inch pilot. This durable steel fan is painted black for corrosion resistance and designed to boost air flow effectively. Ideal for high RPM applications, it features a riveted reinforcement plate for added strength and high-pitch 32° blades for increased efficiency. Perfect for maintaining optimal temperature in racing and high-performance engines.