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 corrosion resistant steel alloy. The most common stainless steel for general hardware use.
A low carbon steel for general use. Zinc plated for moderate corrosion resistance.
A medium duty anchor for use in concrete, brick, or a mortar joint. Used with a lag bolt.