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

Product ID: 680003558

Details

Brand
ACDelco
Core Material
Iridium
Thread Size
14mm
Top Material Type
Nickel
Vehicle Service Type
Car Truck Van

⚡Iridium core for max spark efficiency

🔩14mm precision thread size

🇺🇸Proudly made in the USA

₩355876

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Description

⚡ Ignite your drive with pro-grade spark plugs!

SIX PACK VALUE - Get a full set of 6 plugs to upgrade your entire ignition system at once—no mid-season replacements needed.
MADE IN THE USA - Crafted with American quality standards for reliability and peace of mind on every drive.
DURABILITY THAT LASTS - Nickel top material resists corrosion, extending spark plug lifespan under all conditions.
PRECISION FIT GUARANTEED - 14mm thread size ensures seamless installation across cars, trucks, and vans.
UNMATCHED IGNITION POWER - Iridium core delivers superior spark for optimal engine performance and fuel efficiency.

The ACDelco 41-103 Professional Iridium Spark Plug 6-pack features iridium core technology for enhanced ignition efficiency, a 14mm thread size for universal fitment, and durable nickel tops. Designed for cars, trucks, and vans, these spark plugs are precision-engineered in the USA to deliver reliable performance and long-lasting durability.

Specifications

ASIN	B01JQ2L5DS
Brand Name	ACDelco
Compatible with Vehicle Type	Car, Truck, Van
Core Material	Iridium
Customer Reviews	4.7 4.7 out of 5 stars (882)
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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₩355876

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Korea.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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