Will one of these hold a knife to a wall ?

Depends on how heavy the knife is I use them in my van to hang things from the ceiling they work fine for that

Could these be used to hold a wood valance to a painted steel mini blind header?

Yes, I purchased these for that same reason. The ones that came with my own were not strong enough. I used 3 on a 60in window.

Do you see these without the plate?

Hello- we do sell the magnet outside of the chrome cup, however we don't sell them on Amazon. Please contact our customer service line at 866.867.0941 for assistance. For your convenience, reference product #CR175, as it is the product that most closely resembles the magnet inside the product in question. Thank you!

How to install on plastic boat

Certainly won’t adhere to plastic. Maybe you could epoxy steel plates around the boat. These magnets are pretty strong and would adhere to the plates.

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Master Magnetics Ceramic Round Base Magnet Pack - Heavy-Duty Strong Magnets - 35 lb Pull Each - for Indoor and Outdoor Use - Chrome-Plated - 2.04" Diameter - 0.197" Hole - 0.302" Thick - 6-Pack

Master Magnetics Ceramic Round Base Magnet Pack - Heavy-Duty Strong Magnets - 35 lb Pull Each - for Indoor and Outdoor Use - Chrome-Plated - 2.04" Diameter - 0.197" Hole - 0.302" Thick - 6-Pack

Product ID: 290999476

Details

Material
Ferrite Low
Brand
Master
Product dimensions
5.2L x 5.2W x
Colour
Charcoal Gray
Shape
Round

🔩0.197" center hole for versatile mounting

🧲35 lb pull strength

🛡️Nickel-plated corrosion resistance

Description

🧲 Power your projects with magnetic mastery — don’t get left behind!

TRUSTED SINCE 1976 - Master Magnetics delivers proven quality magnets that professionals rely on worldwide.
VERSATILE MOUNTING HUB - Precision 0.197" center hole fits hooks, knobs, and eyebolts for endless applications.
UNMATCHED HOLDING POWER - 35 lbs of magnetic grip to secure your heaviest projects with confidence.
BUILT TO BRAVE THE ELEMENTS - Nickel-plated finish and ceramic core resist corrosion and heat up to 400°F.
PRECISION ENGINEERED FOR RELIABILITY - Crafted with diamond-ground surfaces and sintered at 2,000°F for consistent strength.

Master Magnetics Ceramic Round Base Magnets offer a robust 35 lb pull strength in a sleek, nickel-plated design. Featuring a 0.197" center hole for versatile mounting, these corrosion-resistant ceramic magnets withstand temperatures up to 400°F, making them perfect for indoor and outdoor heavy-duty applications. Trusted by professionals since 1976, this 6-pack combines precision engineering and durable materials to keep your workspace organized and your projects secure.

Specifications

ASIN	B00IYFNXR0
Best Sellers Rank	136,550 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 928 in Rare Earth Magnets
Brand	Master Magnetics
Colour	Charcoal Gray
Customer Reviews	4.6 out of 5 stars 723 Reviews
Global Trade Identification Number	00095421006755, 10095421006752
Included Components	Magnets
Item Dimensions L x W x Thickness	5.2L x 5.2W x 0.8Th centimetres
Item Shape	Round
Item Thickness	0.3 Inches
Item Weight	0.01 Ounces
Item thickness	0.3 Inches
Manufacturer	Master Magnetics, Inc.
Manufacturer Part Number	RB50CX6
Material	Ferrite , Low carbon steel
Material Type	Ferrite, Low carbon steel
Model Number	RB50CX6
Number of Pieces	6
Product dimensions	5.2L x 5.2W x 0.8Th centimetres
Pull Force	35 Pounds
Shape	Round
UPC	095421006755
Unit Count	5.0 count

Reviews

D**O

Stick like a magnet

Great used to hold a welding stand very strong nice pack ideal

7.05.2024

T**I

تماسك من جه واحده

التماسك فقط من الجه واحد

6.10.2025

C**N

Poderosos para sujetar piezas.

Muy buen tamaño, adecuado para sostener puntas de destornilladores. Tiene mucha fuerza para sujetarlas. Me gustaron.

9.09.2019

J**M

Magnets.

Worked great for the project I was doing

12.03.2026

B**L

Strong enough to do the job!

I bought these magnets to hang a banner on our garage door. I’m impressed with how strong they are and no longer need to worry about the banner coming down in the summer rains. They are also flat so we can still open the garage door without having to remove them.

30.06.2026

B**B

Works great, strong hold

Used on machine door. Nice strong hold

13.04.2026

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