Grade 5 Plow Bolts are made of solid steel with zinc finishes for corrosion protection and long lasting durability. Number 3 head shape is designed to remain flush against the mating surface and is fastened into place with a standard square or hex nut. Countersunk square neck prevents the bolt from turning while tightened or removed. Grade 5 classification offers a middle strength fastener used for moderate construction applications. Dimensions vary per model.