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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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

🛡️Cut & abrasion resistant braided PET

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19534 Ft

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Description

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

TRUSTED TOP RANKED - Highly rated (#97 in Cable Sleeves) with 4.7 stars from 645+ pros
UNMATCHED HEAT DEFENSE - Rated for continuous use up to 150°C (302°F) to protect hot engine bays
EFFORTLESS INSTALLATION - Split design wraps wires with 25% overlap—no zip ties needed
DURABILITY MEETS FLEXIBILITY - Braided PET polyester resists cuts, abrasion, and flame for long-lasting use
SLEEK PROFESSIONAL ORGANIZATION - Keeps automotive and home cables neat with dense, full coverage

This 10-foot braided split-sleeve wire loom is engineered from durable PET polyester, offering superior cut, abrasion, and heat resistance up to 150°C. Its innovative split design enables quick, tool-free installation around automotive and home cables, ensuring professional-grade organization and protection in demanding environments.

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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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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19534 Ft

Duties & taxes included

In stock

Sold byAmazon HungaryDelivered 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 Hungary.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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