Lag bolts are large wood screws with hexagonal heads often called a lag screw.
Hex heads are six sided for use with a wrench.
A low carbon steel for general use. Hot dipped galvanized is a coating for very good corrosion resistance.
These bolts have a flange under the head to distribute the load.
A medium duty anchor for use in concrete, brick, or a mortar joint. Used with a lag bolt.