What is the socket size of the spark plug?

You will use either a 16mm deep socket or 5/16" spark plug socket for installation. Be certain to verify each spark plug gap at .044" before you install.

2012 Hyundai Elantra—Amazon says it fits this car but has anyone tried it?

According to the NGK Part Finder, it only works for the L4 1.8L Engine. You need the ZFR5FIX-11 for the 2.0 Engine. The OE Part for the 2.0 is IZFR5L11

Are these better than the original honda crv (2011) spark plugs (denso sxu22hcr11s)?

I think so. I have iridium plugs in all my cars.

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LKR7DIX-11S Iridium IX Spark Plug (93175 Iridium Ix), 4 Pack

Product ID: 76990459

Details

Brand
NGK
Core Material
Iridium
Thread Size
5/8 inch
Top Material Type
Metal
Vehicle Service Type
Car Truck

⚡0.6mm Iridium tip for extreme ignitability

🔥High melting point Iridium alloy for heat durability

🔧Triple gasket seal prevents combustion gas leakage

44571CFA

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Description

⚡ Ignite your drive with NGK Iridium IX – where precision meets power!

LEAK PROOF PERFORMANCE - Triple gasket seal and corrugated insulator ribs eliminate combustion gas leaks and flashover.
ENGINEERED FOR ENDURANCE - Iridium alloy withstands extreme heat and electrical wear, perfect for high-performance engines.
PRECISION IGNITION POWER - Laser-welded 0.6mm Iridium tip delivers unmatched spark stability and throttle response.
CORROSION RESISTANT BUILD - Trivalent metal plating ensures superior anti-corrosion and anti-seizing for long-lasting reliability.
PERFECT FIT EASY INSTALLATION - 5/8 inch hex size and vehicle-specific design guarantee seamless replacement and optimal performance.

The NGK LKR7DIX-11S Iridium IX Spark Plug 4-pack features a laser-welded 0.6mm fine Iridium tip for superior ignitability and throttle response. Built with a high melting point Iridium alloy and triple gasket seal, it ensures durability, prevents combustion gas leakage, and resists corrosion. Designed for high-performance vehicles, it offers reliable, long-lasting ignition with easy installation.

Specifications

ASIN	B07FP6KFLT
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#2,901 in Automotive ( See Top 100 in Automotive ) #9 in Automotive Replacement Spark Plugs
Brand Name	NGK
Compatible with Vehicle Type	Car, Truck
Core Material	Iridium
Customer Reviews	4.7 4.7 out of 5 stars (2,246)
Gap Size	0.04 Inches
Global Trade Identification Number	00087295831755
Included Components	Spark Plug (4)
Item Type Name	Spark Plug (93175 Iridium Ix )
Item Weight	6.4 ounces
Manufacturer	NGK
Manufacturer Part Number	93175
Manufacturer Warranty Description	Includes manufacturer provided warranty
Model Number	LKR7DIX-11S
OEM Equivalent Part Number	Cross-reference is for reference only. Confirm compatibility with your vehicle. Omnicraft QSP8
Thread Size	5/8 inch
Top Material Type	Metal
UPC	087295831755
Unit Count	1.0 Count

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