The Autolite Racing Plug AUTAR3934 is engineered for peak performance in demanding racing environments. Featuring a 14 mm thread and a 0.750-inch reach, this plug is equipped with a gasket seat and a non-resistor design to ensure optimal conductivity and spark consistency. Perfect for drivers who seek reliability and enhanced ignition capability in competitions. Fits efficiently with dimensions of 3.5 x 1.1 x 1.0 inches, making it a versatile addition to your racing toolkit.