All blocks once height.

AllBlocksOnceHeight

function setEqualHeight(columns){
  var tallestcolumn = 0;

  columns.each(function(){
  var currentHeight = $(this).height();
    if(currentHeight > tallestcolumn){
      tallestcolumn = currentHeight;
    }
  });
  columns.height(tallestcolumn);
}

$(document).ready(function() {
  setEqualHeight($(".grid > .col-md-6"));
});