NotcHead Fire Wall rings are the added touch to finish your engine bay. No longer will you need rubber trim or grommets to protect and finish heater or air conditioning access holes through your firewall. Customize the look of your firewall, fender well, trunk pan or anywhere on your vehicle that you need to route wire or hose through. These grommets are available in a polished, machined, or black anodized finish and feature an ABS plastic retaining nut to adapt to a variety of material thicknesses for your application.