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 Fishing Magnet, 2 Inch 350 Lbs Large Strong Magnets for Lifting | Powerful Magnetic Tags Removal Tool High Power Heavy Duty Pickup for Treasure Hunting Retrieving Items in Lake and Beach

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

21879CFA

Duties & taxes included

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧲 Hook the hidden treasures others miss!

PRECISION FORCE FOCUS - Magnetic strength concentrated at the base for maximum retrieval efficiency.
UNMATCHED MAGNETIC MIGHT - 350 lbs of pure neodymium power to haul your finds effortlessly.
BUILT TO BRAVE THE ELEMENTS - Triple-layer Ni+Cu+Ni coating ensures rust-free, long-lasting shine and durability.
CERTIFIED QUALITY ASSURANCE - Manufactured under ISO 9001 standards for reliability you can trust.
VERSATILE TREASURE HUNTERS TOOL - Countersunk hole and eyebolt design perfect for underwater salvage and heavy lifting.

The DIYMAG Fishing Magnet is a 2-inch diameter neodymium magnet delivering a powerful 350 lbs pull force. Featuring a durable Ni+Cu+Ni triple-layer coating and ISO 9001 certified manufacturing, it offers permanent magnetic strength focused at the base for efficient lifting and retrieval. Designed with a countersunk hole and eyebolt, it’s ideal for magnet fishing, underwater salvage, and heavy-duty lifting tasks.

Specifications

ASIN	B0BDFJWGWY
Best Sellers Rank	#654 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 (15,724)
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 kg
Manufacturer	DIYMAG
Material Type	Neodymium
Number of Pieces	1
Part Number	NCN50-1P
Pull Force	300 pounds
Shape	Round
Unit Count	1 Count

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