BRISK SPARK PLUG IDENTIFICATION SYSTEM D   Shell Dimensions     Width  Thread Size   Thread Length  How Plug Seats   D 17.5 mm  14 mm x 1.25   19 mm  Sealing ring   E ?  14 mm x 1.25   ?  ?   G 16 mm  14 mm x 1.25   17.5 mm  Conical seat   H 16 mm  14 mm x 1.25   11.2 mm  Conical Seat   K 21 mm  14 mm x 1.25   9.5 mm  Seating ring   L 21 mm  14 mm x 1.25   19 mm  Sealing ring   N 21 mm  14 mm x 1.25   12.7 mm  Sealing ring   R ?  14 mm x 1.25   ?  ? R   Radio interference suppression 15   Set Heat Range:           Hot  19 - 18 - 17 - 16 - 15 - 14 - 12 - 10 - 8  Cold Y   Type of Hot Electrode Used to Create Pre-set Spark Gap        Y   Projected hot electrode insulator tip C   Electrode Material        Copper cored centre electrode SUPER -1   Spark Plug Gap -6 0.026" (0.020 - 0.029) 0.036" (0.030 - 0.039) -1 0.045" (0.040 - 0.048) -3 0.052" (0.049 - above) LSG Brisk Thread Sizes          .10 mm (No LSG Brisk Halo ring tip available at this time)          .12 mm (LSG Brisk may produce in 2006)          .14 mm (All LSG Brisk Spark Plugs)