Kit Content:1 x NGK COP (Rail) Ignition Coil Assembly4 x NGK Direct Ignition Coil Boots4 x NGK Iridium IX Spark PlugsItem Description:Thread Diameter(in): (Spark Plugs) 0.551Coil Type: (Ignition Coil) COP (Rail System)Boot Material: (Direct Ignition Coil Boots) RubberCenter Electrode Core Material: (Spark Plugs) Copper CoreGrade Type: (Direct Ignition Coil Boots) PremiumCenter Electrode Tip Material: (Spark Plugs) IridiumGround Electrode Quantity: (Spark Plugs) 1Ground Electrode Tip Design(Ohms): (Spark Plugs) Taper CutResistance(Ohms): (Spark Plugs) 5000Mounting Bracket Included: (Ignition Coil) NoManufacturer Heat Range: (Spark Plugs) 6Seat Type: (Spark Plugs) TaperedPre-Gap Size(in): (Spark Plugs) 0.044Hex Size: (Spark Plugs) 5/8"Ignition Type: (Ignition Coil) DistributorlessInsulator Height(mm): (Spark Plugs) 53.00Ground Configuration: (Spark Plugs) StandardBoot Color: (Direct Ignition Coil Boots) BlackGround Electrode Core Material: (Spark Plugs) Nickel CoreReach(mm): (Spark Plugs) 25.00