Review on Denso SK20HR11 Iridium Spark Single by Jonathan King

Great replacement spark plugs for my 2008 Toyota 4Runner. Delivered as promised, satisfied except for one major problem. The delivery was of poor quality. Each spark plug came in its own little box, all six of which I ordered were simply placed on cardboard and then wrapped in that cardboard. The pair was partially out of the box at the time of delivery. The flash point cover was left in place. I was concerned about the porcelain part which I checked without noticing any issues. I'm careful about installing with the right outlet, so I hope they work well when I install them in the near future. Otherwise I would have given five stars.