Find Aftermarket Truck Frame Nut Covers for the Mack RD Model. Upgrade your Mack RD s look with stylish and protective frame nut covers. Choose from cool designs like chrome top hats, skulls, and spikes to match your style. Sizes range from 5/8 inch to 1 1/8 inch, ensuring a perfect fit for your truck's nuts and bolts. These covers not only add flair but also protect your hardware from wear and tear, keeping your rig polished and road-ready. Dress up your Mack RD and keep it looking sharp with these must-have nut covers!