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 power!

BULK PACK ADVANTAGE - 6 spark plugs in one pack to keep your engine running smooth without frequent replacements.
COMPACT LIGHTWEIGHT - Slim design (5.19 x 4.28 x 0.93 inches) and light weight (0.65 lbs) for easy installation.
TRUSTED BRAND QUALITY - ACDelco’s professional-grade spark plugs trusted by mechanics worldwide.
ENGINEERED FOR LONGEVITY - Precision manufacturing delivers enhanced durability and extended lifespan.
UNMATCHED IGNITION POWER - Iridium tip ensures faster, more reliable starts every time.

The ACDelco41-103 Professional Iridium Spark Plug 6-pack offers high-performance ignition with durable iridium tips, engineered for longevity and consistent engine efficiency. Compact and lightweight, these spark plugs are a trusted choice for professionals seeking reliable starts and extended service life.

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Manufacturer	ACDelco
Brand	ACDelco
Item Weight	10.5 ounces
Package Dimensions	5.39 x 4.45 x 0.94 inches
Is Discontinued By Manufacturer	No
Manufacturer Part Number	41-103

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

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