V7652, 12 Pack, Zinc Plated Flat Head Carriage Bolts & Nuts, 1/4-Inch Diameter x 20 Threads Per Inch x 1-3/4-Inch Length, Use On Wood Or Hole In Steel, Prevents Spinning During Installation & Tightening, Tighten Without Being On Both Sides Of The Door, Specifically Used On Wood Or Steel Garage Doors, Carded.