2015+ Silverado 2500 HD and 3500 HD Bumper Grille Insert “LTZ” Edition. This insert and brackets are made of 100% 304 Grade Stainless Steel. The insert and mounting brackets are also powder coated black to add another layer of protection to the elements. This is made to protect your intercooler while maintaining airflow through the hole in your front bumper. Install is easy and can be done from the front of the vehicle.