Autolite 4 Pack Of Extreme Start Iridium Enhanced Spark Plugs - Xst458dp-4pk

Genuine Autolite replacement part. Thread Size: 14mm, Thread Pitch: 1.25mm, Seat Type: Gasket, Reach: 9.5mm (3/8"). Hex Size: 13/16" (21mm), Terminal Type: Solid. Material: Iridium-Platinum, Type: Fine Wire, Size: 0.6mm, Projection: Non-Projected. Iridium and platinum electrodes provide the durability of double platinum plugs with virtually no gap erosion, longer life, and top fuel efficiency over the life of the plug. Fine wire electrodes provide increased ignitability.