【Pre-gap】Spark plug Pre-gapped, can be installed directly! 【Replace part number】3951, TR55, 3186, ‎TR5GP, 41-162, ‎19417055, 41-962, 19299585, 3403, TR55GP, 7397, TR5IX, SP-493, AGSF32PM, AGSF22WM, SP-479, 41-101, 12568387, 4177, 41-993, 19256067, AP104, R44LTS, 41-110, 12621258 Iridium spark plugs. 【Iridium Design】Iridium Spark Plugs has extremely high melting point, giving it high durability to heat and electrical wear, perfect for today's high performance engines 【FUEL EFFICIENCY】 These spark plugs utilize a finewire iridium centerwire tip design with laser welded technology for maximum fuel efficiency. Our finewire electrodes produce more focused and consistent ignitability resulting in less fuel consumption Autowxjq Iridium Spark Plugs are engineered to deliver both high performance and long life, The ultra-fine wire design and laser welded tapered ground electrode deliver optimum performance, while the Iridium center electrode and Iridum tipped ground electrode help it to go the distance. Autowxjq Iridium Spark Plugs are pre-gapped at the factory , for simple, easy installation right out of the box. Unlock the performance in your engine with Autowxjq Iridium Spark Plugs