Product Overview:- Ngk Spark Plugs (U.S.A.), Inc. Is The Largest Oe Supplier And Manufacturer Of Spark Plugs For Domestic And Import Vehicles In North America. Its Oe Legacy, Unsurpassed Quality And Leading Vehicles In Operation Coverage Reinforces Ngk As The Ignition Specialist. With Over 80 Years Of Automotive Expertise Ngk Has Built A Reputation For Quality And Reliability; Manufacturing Spark Plugs For Virtually Every Automotive, Motorcycle, Marine And Small Engine Application. We Are Committed To Be The Premier Partner With Our Customers, While Maintaining Original Equipment Standards For The Highest Durability And Operational Performance. With State-Of-The-Art Manufacturing, Inventory And Distribution Facilities In North America And Across The Globe, Ngk Is Dedicated To Providing Customers With World-Class Products And Services. Product Info:- Ngk Racing Spark Plug Box Of 4 (R5671a-11)- Racing Use- Spark PlugItem Description:-ShellThread Diameter: 14MmThread Pitch: 1.25MmSeat Type: GasketReach: 19Mm (3/4")Hex Size: 5/8" (16Mm)Terminal Type: SolidOverall Height: IsoGap: .020" (0.5Mm)-Center ElectrodeMaterial: NickelType: V-CutSize: 2.5MmProjection: Non-Projected-Ground ElectrodeMaterial: NickelType: StandardQuantity: 1-SpecificationsResistor: NoResistor Value: 1K OhmHeat Range: 11Features: Copper GasketTorque Specs: Cast Iron: 18-25.3 Lb. Ft. Aluminum: 18-21.6 Lb. Ft.Manufacturer Part Number:- 6596