Hillman 1/4 x 1/2 in. Ribneck Bolts & Nuts Zinc-Plated are i fasteners designed specifically for certain garage door hardware on fiberglass doors. These bolts and nuts feature zinc plating, which moderate corrosion protection, ensuring durability and reliability over time. The package comes complete with instructions, mounting hardware, and essential warning and safety information to guide proper installation. It is important to follow the included warnings carefully, as incorrect installation or improper door positioning can result in serious injury or death. This product combines quality and safety for your garage door maintenance needs. Model Number: