Twist & Lock Black ABS Aero Axle Cover Set For 22.5" Dual Wheels Black ABS Cover Set For 22.5" Dual Wheel Tractors & Trailers Fits 22.5" Dual Wheels With 5/8" or 3/4" Drive Axle Bolts and 5.5" or 6.75" Trailer Bolt Circles (Choose Bolt Size Above) Available With Anti-Theft Lock Kit (Choose Option Above) Constructed From High Impact ABS Plastic Test Data Shows 1% to 2% in Fuel Saving Kit Includes 4 Covers, 4 Brackets, And Mounting Hardware Easy To Install and Remove Quality American Made Product These high quality, American made wheel covers from RWC are not only stylish but aerodynamic as well! Keep your truck looking good and save on fuel costs while you do it. Test data shows that these aerodynamic wheel covers cut down on fuel costs by 1 to 2%. Featuring the new Twist & Lock design, the installation and removal of a wheel cover has never been easier. If you should need additional Truck Parts and Accessories, please don't hesitate to call our toll-free number 1-888-888-7990