A-Premium Iridium Platinum Spark Plugs Compatible with Chevrolet Silverado 1500, Express 2500/3500, Trailblazer & GMC Sierra, Savana, Envoy & Buick Rainier & Isuzu Ascender & Oldsmobile, Pack of 6

[Reference Number]: A-Premium Spark Plugs fit for 91418, ILTR5E11, 12598004, 12622441, 12625058, 3474. [Vehicle Fitment-1]: Compatible with Silverado 1500 spark plugs; Compatible with Buick Rainier 2004-2007 L6 4.2L; Compatible with Chevrolet Express 2500 2018-2020 V6 4.3L, Express 3500 2018-2020 V6 4.3L, Silverado 1500 2014-2021 V6 4.3L, Trailblazer 2002-2002 L6 4.2L, Trailblazer 2003-2005 L6 4.2L, Trailblazer 2006-2009 L6 4.2L, Trailblazer EXT 2002-2006 L6 4.2L; Compatible with Isuzu Ascender 2003-2008 L6 4.2L. [Vehicle Fitment-2]: Compatible with Sierra 1500 spark plugs; Compatible with GMC Envoy 2002-2002 L6 4.2L (Gap 0.044""), Envoy 2003-2005 L6 4.2L (Gap 0.050""), Envoy 2006-2009 L6 4.2L (Gap 0.044""), Envoy XL 2002-2006 L6 4.2L (Gap 0.044""), Envoy XUV 2004-2005 L6 4.2L (Gap 0.044""), Savana 2500 2018-2020 V6 4.3L (Gap 0.040""), Savana 3500 2018-2020 V6 4.3L, Sierra 1500 2014-2021 V6 4.3L; Compatible with Saab 9-7x 2005-2009 L6 4.2L; Compatible with Oldsmobile Bravada 2002-2004 L6 4.2L. [Specifications]: ①Center Electrode Tip Material: Iridium; ②Center Electrode Core Material: Platinum; ③Resistance (ohms): 5000; ④Gap Size (IN): 0.044; ⑤Hex Size (IN): 5/8; ⑥Insulator Height (mm): 53.00; ⑦Reach (mm): 25.00; ⑧Thread Diameter (MM): 14. [Engineered for Longevity]: For optimal engine performance and longevity, it is recommended to replace platinum iridium spark plugs at mileage intervals of 80,000 to 100,000 miles