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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⚡ Ignite your ride with precision and power — don’t get left behind!

PRECISION IGNITION POWER - Fine 0.6mm iridium tip delivers ultra-stable sparks for peak engine performance.
HEAT RESISTANT DURABILITY - Iridium alloy withstands extreme temperatures and electrical wear for long-lasting reliability.
OPTIMIZED COMBUSTION SEAL - Triple gasket design eliminates combustion gas leaks, maximizing engine efficiency.
CORROSION SEIZE PROTECTION - Trivalent metal plating ensures superior resistance to corrosion and seizing under harsh conditions.
ANTI FOULING FLASHOVER DEFENSE - Longer insulator nose and corrugated ribs prevent fouling and flashover, keeping your engine clean.

The NGK LKR7DIX-11S Iridium IX Spark Plug 4-pack is engineered for performance enthusiasts seeking extreme ignitability and durability. Featuring a laser-welded 0.6mm iridium tip, high melting point alloy, and advanced sealing technology, these spark plugs deliver improved throttle response, superior anti-fouling, and corrosion resistance—perfect for high-performance engines demanding reliability and efficiency.

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Manufacturer	NGK
Brand	NGK
Model	Spark Plug
Product Dimensions	14.81 x 10.16 x 2.54 cm; 181.44 g
Item model number	LKR7DIX-11S
Exterior	Painted
Manufacturer Part Number	93175
Position	Front, Rear
Item Weight	181 g

NGKLKR7DIX-11S Iridium IX Spark Plug (93175 Iridium Ix), 4 Pack

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