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

Product ID: 209821071

Details

Brand
ACDelco
Core material
Iridium
Thread size
14mm
Top material type
Nickel
Vehicle service type
Motorcycle

⚡Iridium core for max ignition

📦6-pack for long-lasting performance

🔧14mm precision thread size

Description

⚡ Ignite your ride with pro-grade spark plugs!

TRUSTED BY PROS - ACDelco’s 4.7-star rating from 873 reviews proves reliability and customer satisfaction.
BULK PACK ADVANTAGE - 6-pack bundle keeps your engine firing strong without frequent replacements.
DURABILITY THAT LASTS - Premium nickel top material resists wear and corrosion, extending spark plug life.
PERFECT FIT EVERY TIME - Vehicle-specific 14mm thread size ensures hassle-free installation and optimal performance.
UNMATCHED IGNITION POWER - Iridium core delivers superior spark for efficient combustion and smoother rides.

The ACDelco 41-103 Professional Iridium Spark Plug 6-pack features iridium core technology for enhanced ignition efficiency, a precise 14mm thread size for vehicle-specific fit, and durable nickel tops for long-lasting performance. Trusted by thousands with a 4.7-star rating, this set ensures reliable, smooth engine starts and sustained power for motorcycles.

Specifications

ASIN	B01JQ2L5DS
Automotive Fit Type	Vehicle Specific Fit
Brand Name	ACDelco
Compatible with Vehicle Type	Motorcycle
Core Material	Iridium
Customer Reviews	4.7 4.7 out of 5 stars (880)
Manufacturer	Ac Delco
Manufacturer Part Number	41-103
OEM Equivalent Part Number	41-103
Thread Size	14mm
Top Material Type	Nickel
UPC	707773689622
Unit Count	6.0 count

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