NGK has announced that IZFR6J11 (92383) is Obsolete and has been replaced by IZFR6J (4462).
NGK Laser Iridium spark plugs offer the best combination of performance and longevity. Engineered specifically for OE applications, Laser Iridium spark plugs are tested to the highest standards to ensure quality and durability. Iridium tipped center electrode provides durability six times harder than platinum. NGKs high grade pure alumina ceramic and 98 percent pure copper core prevents the spark plug from overheating while providing reliable starts. Most Laser Iridium spark plugs feature a platinum pad on the ground electrode for even wear in distributorless ignition systems.

Specifications;
Resistance Ohms 5000.0
Ground Electrode Tip Design Standard
Ground Configuration J-Gap
Ground Electrode Core Material Nickel
Washer Included Yes
Grade Type Performance
Electrical Terminal Type Non-Removable Nut
Center Electrode Core Material Copper
Center Electrode Tip Material Iridium
Pre-Gap Size in .032
Pre-Gap Size mm 0.8
Ground Electrode Quantity 1
Hex Size 5/8" (16mm)
Insulator Height in 1.99
Insulator Height mm 50.5
Manufacturer Heat Range 6
Seat Type Flat
Reach in 0.750
Reach mm 19.0
Thread Diameter in 0.551
Thread Diameter mm 14.0
Insulator Material Ceramic
Resistor Type Yes
Skirt Length in 0.0
Skirt Length mm 0.0
Ground Electrode Tip Material Platinum
Skirt No
Center Electrode Insulator Tip Projection in 0.35
Center Electrode Insulator Tip Projection mm 9.0
Center Electrode Design Fine Wire
Washer Type Crush
Center Electrode Projection Extra-Long Projection