Is 1/4" and 3/8" so close in actual size there is no discernable difference?

There is a difference. The 1/4” measures 3/8” od with an overlap of 1/4”. The 3/8” measures1/2” od with an overlap of about 3/4.

What is the best way to measure the wires so I can determine the correct size needed to completely wrap around my wiring harness?

For example, the 1/2" loom size will fit around a 1/2" diameter wire bundle. You'll get about 25% overlap of the material.

Will this protect cable and ethernet wires if I run it over an electric radiator?

I would say no. It is just weaved plastic strands. It protects against scuff and possibly sharp edges but not heat. If you want heat protection use exhaust heat wrap

does this help stop rats and mice from eating your wires??

Definitely makes it harder for rodents to eat through to the wires but its not a guaranteed solution. Given enough time rodents will likely eat through anything that isn't metal mesh.

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MGI SpeedWare Braided Split-Sleeve Black Wire Loom for High-Temperature Automotive Harness and Home Cable Management 10 Feet (1/2")

MGI SpeedWare Braided Split-Sleeve Black Wire Loom for High-Temperature Automotive Harness and Home Cable Management 10 Feet (1/2")

Product ID: 328173158

Details

Brand
MGI SpeedWare
Colour
Black
Material
Polyethylene
Product dimensions
3.05L x 0.01W
Style
Braided

📏10 feet length with 1/2" diameter

🔥Heat-resistant up to 150°C

🛠️Durable braided PET polyester

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€ 58.10

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In stock

Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Wrap it. Protect it. Own the heat. 🔥

RUGGED DURABILITY - Braided PET polyester resists cuts and abrasion for long-lasting protection
SLEEK ORGANIZATION - Keeps automotive and home cables neat, safe, and tangle-free
ULTIMATE HEAT DEFENSE - Withstands scorching temperatures up to 150°C (302°F)
GENEROUS LENGTH SIZE - 10 feet of 1/2" sleeving fits most harnesses and cable bundles
EFFORTLESS INSTALLATION - Split design with 25% overlap wraps wires in seconds

The MGI SpeedWare Braided Split-Sleeve is a 10-foot, 1/2-inch diameter wire loom made from durable, cut- and heat-resistant braided PET polyester. Designed for high-temperature automotive harnesses and home cable management, it features a convenient split design with 25% overlap for quick installation and reliable protection up to 150°C (302°F).

Specifications

ASIN	B08ZSC39C6
Best Sellers Rank	#20,978 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #97 in Cable Sleeves
Brand	MGI SpeedWare
Color	Black
Customer Reviews	4.7 4.7 out of 5 stars (645)
Enclosure Material	Polyethylene Terephthalate
Installation Type	Slide-On
Item Dimensions L x W	3.05L x 0.01W Meters
Manufacturer	MGI
Manufacturer Contact Information	[email protected]
Mfr Part Number	Cavalrywolf
Number of Pieces	1
Style Name	Braided
Unit Count	1.0 Count

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