Proflow's billet hood Bonnet hinges are CNC-machined to perfection from high-quality 6061-T6 billet aluminium. They provide a stunning alternative to your vehicle's unsightly stock stamped steel hinges and springs. These hinges are enhanced by the included nitrogen-filled gas struts and sealed bearings. Proflow's billet replacements give your hood outstanding stability and flawless operation that is simply not possible with 40 or 50 year old stock hinges. Not Recommended For Use With Fiberglass Bonnets.