Can you use this magnet to guide a metal plumbob inside a wall to a predrilled hole for fishing electrical wire from basement to attic?

If any metal in the wall it will stick to it. This is a very strong magnet and you may lose it in the wall if you use a cheap string...

Are you supposed to add thread locker?

If on fishing line you should not need to. I don't know why you would need to remove the ring from the magnet housing, but you could add some thread-lock.

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DIYMAG Magnet 2 Inches 350 Lbs Strong Magnets Fishing Nail Removal Tool Pickup Super Heavy Duty Security Large Tags Neodymium Big Remover Powerful Strongest Clothes Magnetic High Power (50mm)

Product ID: 494025837

Details

Brand
DIYMAG
Color
Single Hole
Material
Neodymium
Product Dimensions
1.96"L x x
Shape
Round

🧲350 lbs pull power

⚙️ISO 9001 certified quality

🛡️Ni+Cu+Ni triple-layer coating

$28.43

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧲 Elevate your magnet game—pull more, find more, last longer!

BUILT TO LAST - Triple-layer Ni+Cu+Ni coating ensures rust resistance and durability in any environment.
PERMANENT POWER - Rare earth neodymium magnetism that stays strong for decades—no fading, no compromise.
VERSATILE UTILITY - Countersunk hole and eyebolt design perfect for fishing, lifting, and industrial retrieval tasks.
PRECISION ENGINEERED - Magnetic force focused at the base, protected by a steel cup for maximum efficiency.
UNMATCHED MAGNETIC MIGHT - 350 lbs of pure neodymium power to lift and retrieve with ease.

The DIYMAG 2-inch neodymium magnet delivers an impressive 350 lbs of pull force, engineered with a triple-layer Ni+Cu+Ni coating for superior rust resistance and durability. ISO 9001 certified, this magnet features a steel cup design that concentrates magnetic strength at the base, making it ideal for heavy-duty fishing, lifting, and retrieval applications. Its permanent magnetism ensures consistent performance for decades, making it the ultimate tool for professionals and hobbyists alike.

Specifications

ASIN	B0BDFJWGWY
Best Sellers Rank	#954 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Lift Magnets
Brand Name	DIYMAG
Color	Single Hole
Customer Reviews	4.3 4.3 out of 5 stars (12,918)
Included Components	magnets
Item Dimensions L x W x Thickness	1.96"L x 1.96"W x 2.05"Th
Item Thickness	2 Inches
Item Weight	0.18 Kilograms
Manufacturer	DIYMAG
Material Type	Neodymium
Number of Pieces	1
Part Number	NCN50-1P
Pull Force	300 Pounds
Shape	Round
Unit Count	1.0 Count

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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