MODEL/HZNGKCHAMPIONDENSOBOSCHTHREADREACHHEXGAPVERSIONSA7TCC7HSAZ10YCU22FS-UUR2ASM10*1.00MM12.7MM16MM0.6MMSTANDARDA7RTCCR7HSRZ10Y12.7MM16MM0.6MMPROJECTIVE,RESISTORD8TCD8EAA8YCX16EPX4DCM12*1.25MM19MM17.5MM0.6MMSTANDARDD8RTCDPR8EARA8YCX16EPRXR4DCM12*1.25MM19MM17.5MM0.6MMPROJECTIVE,RESISTORE6TCBP7HSL87YCW16FPW6BCM14*1.25MM12.7MM20.8MM0.7MMSTANDARDE6RTCBPR6HSRL87YCW16FPRWR6BCM14*1.25MM12.7MM20.8MM0.6MMPROJECTIVE,RESISTORF6TCBP6ESN11YCW16EPW8DCM14*1.25MM19MM20.8MM0.8MMSTANDARDF6RTCBPR6ESRN11YCW16EXRW7DCM14*1.25MM19MM20.8MM0.8MMPROJECTIVE,RESISTOR spark plugs' specification:Routine maintenance .it is recommended to replace your old plugs' every 30000 to 45000 milesAs old ,foulded or damaged plus' will impact the power and fuel efficiency so replace a quality and newplug is necessay to regain your lost plower.Good quality OEM plugs should be :1:Multi-ribs designed for the insulators can ensure eliminate flashover2:New good quality insulators provide more better insulation ,heat dissipation resist heat shock and mechanical failure3:The shell with different type plated nickel prevents oxidation and corrosion ,electric cold and heat press ensure reliable seal4:Resistor glass not only ensure conductivity and sealing but also provide proction from radio interference5:The central electrode has a deeply inserted nickel alloy tip,vastly improve heat dissipation and prevent overheating damage the engine6:large space between the insulator and metal shell enduces fouling and keep it clean