Reliable CBZ38412L Carriage Bolt, 3/8-16 Thread, Coarse, Full Thread, 4-1/2 in OAL, Steel, Zinc, A Grade

These round head carriage bolts are made of zinc-plated steel and are primarily used with wood. The square found under the head pulls into the wood as the nut is tightened. Their zinc plating grants them a moderate protection against corrosion.