An Industry Exclusive Solution For Mounting Spal'S 300 Or 500-Watt Brushless Fans To Nearly Any Radiator. Injection Molded From A Heat Resistant Space Age Polymer Offering Decades Of Performance And Durability. Easily Trimmable To Fit Most Applications And Offers Full Coverage On Core Sizes Between 22.5" To 27.5" Wide. A direct fit on All Models Built With Hat Channel Side Supports. Includes All Mounting Hardware And Flaps - Fan is not included.