Genuine Champion replacement part. Thread Size: 14mm, Seat Type: Gasket, Resistor Type: SAC9, Reach: 19mm (3/4"). Hex Size: 13/16" (21mm), Terminal Type: Removable Nut, Gap:.031" (0.8mm). Material: Nickel, Type: Standard, Size: 2.5mm, Projection: Projected. Conventional spark plug with nickel alloy electrodes. Copper core center electrode allows for increased conductivity and heat control.