Plugs are among the essential spoons that ought to be in every fisherman's tackle box.  A plug is essentially a tube shaped lure with multiple hooks located on the back and bottom.  A bluefish plug are between 6 and 10 inches long and made from wood or composite materials.  A few models have a swing in the center so that they are essentially two separate pieces.  Plugs are painted to look like food fish and they can work at different levels of water.