Extreme Long Life Laser Iridium Plug, 14mm Thread, 19mm (3/4") Reach, 13/16" (20.6mm) Hex Size, Gasket Seat, Resistor, Solid Terminal, Iridium Tipped Fine Wire Center Electrode and Platinum Tipped Ground Electrode, .020" (0.508mm) Gap. Used on most TaG and shifter engines, i.e. Parilla Leopard, PRD Fireball, TM ICC, Honda CR80 & CR125, etc