What size socket is need for removel and inserting these

I believe a 5/8 spark plug socket.

Hola el anuncio dice 1 spark plug, no dice paquete de 6, en las respuestas dice que es un paquete de 6 bujias, porque no se específica en el anuncio?

Hola! El paquete trae 6 bujías. Puedes comprarlo con confianza, son 100% genuinas.

is this the correct size for a 2002 chevrolet trailblazer lt 4.2?

Most likely. The Trailblazer and the GMC Envoy have the same engine, and it fit the Envoy engine that I have. Be careful not to cross thread however. That is easy to do and anti-seize on the threads is highly recommended.

Why this side say do not fit on my chevrolet trailblazer ltz 4.2 l6 year 2003?

41-103 is CORRECT number for your vehicle. You can buy either iridium plugs (which is what I purchased in Oct 2017, and they still work fine) or you can buy the cheap original equipment plugs. But the 41-103 will work fine. Safe motoring

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⚡ Ignite your drive with pro-grade spark plugs!

MADE IN THE USA - Crafted with quality and reliability you can trust, supporting local manufacturing
DURABILITY THAT LASTS - Nickel top material resists corrosion and wear for extended lifespan
PRECISION FIT GUARANTEED - 14mm thread size ensures seamless installation and optimal compatibility
UNMATCHED IGNITION POWER - Iridium core delivers superior spark for peak engine performance
VERSATILE VEHICLE COMPATIBILITY - Perfect for cars, trucks, and vans—upgrade your ride effortlessly

The ACDelco 41-103 Professional Iridium Spark Plug 6-pack features a high-performance iridium core and durable nickel top, designed for reliable ignition and long-lasting durability. With a precise 14mm thread size, these spark plugs fit a wide range of cars, trucks, and vans. Proudly made in the USA, they deliver consistent power and efficiency to keep your engine running smoothly.

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Brand	ACDelco
Core Material	Iridium
Thread Size	14mm
Top Material Type	Nickel
Vehicle Service Type	Car, Truck, Van
UPC	707773689622
Package Dimensions	13.69 x 11.3 x 2.39 cm; 299 g
Item part number	41-103
Manufacturer Part Number	41-103
Country of Origin	USA
Item Weight	299 g

ac-delco ACDelco 41-103 Professional Iridium Spark Plug (6 Pack)

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