The Hillman Group 852140 1/4 x 1/2-Inch Ribneck Carriage Bolts and Nuts, Zinc Plated Ideal as a replacement fastener for certain garage door hardware on fiberglass doors Package includes instructions, mounting hardware and warning/safety information Steel Material/Zinc Plated WARNING: INCORRECT INSTALLATION OR DOOR POSITION CAN CAUSE SERIOUS INJURY OR DEATH See package warnings and enclosed instructions