Denso Nickel Spark Plug K16R-U11 / 3120 Replace BKR5EY11 BKR5EYA11 VL39U-Groove is an innovative design that helped to make DENSO spark plugs famous. The plug employs a unique, channeled ground electrode designed to generate a larger spark nucleus at the point of ignition. Copper glass seal helps heat dissipation Standard U-groove Deeply inserted copper core Heat resistant nickel plating DIMENSIONS: Height (mm): 43 Width (mm): 24.5 Length (mm): 85