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

💪35 lb pull strength

🌡️Withstands up to 400°F

🛠️0.197" center hole for versatile mounting

HK$383

Duties & taxes included

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Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧲 Stick with the best — power, precision, and durability in every magnet!

TRUSTED SINCE 76 - Master Magnetics’ legacy means you’re investing in proven quality and industrial-grade performance.
VERSATILE MOUNTING HUB - Precision 0.197" center hole fits hooks, eyebolts, and more 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 ceramic magnets resist corrosion and heat up to 400°F—indoors or out.
PRECISION ENGINEERED FOR RELIABILITY - Crafted with diamond-ground finish and sintered at 2,000°F for consistent, long-lasting strength.

Master Magnetics Ceramic Round Base Magnets deliver a robust 35 lb pull force with a versatile 0.197" center hole, perfect for professional and DIY use. Their corrosion-resistant nickel plating and heat tolerance up to 400°F ensure reliable performance indoors and outdoors. Precision-crafted from ferrite materials and backed by decades of trusted manufacturing, this 6-pack is the ultimate magnetic solution for heavy-duty holding and mounting needs.

Specifications

ASIN	B00IYFNXR0
Best Sellers Rank	78,567 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 582 in Rare Earth Magnets
Brand	Master Magnetics
Colour	Charcoal Gray
Country Of Origin	China
Customer Reviews	4.6 out of 5 stars 683 Reviews
Global Trade Identification Number	00095421006755, 10095421006752
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**O

Muy fuertes

Los uso para levantar laminas desde el suelo con una agarradera, han funcionado perfectamente, tomen en cuenta que el iman es solo fuerte de un lado.

5.08.2019

J**M

Magnets.

Worked great for the project I was doing

12.03.2026

R**Z

Bueno

Bien

5.02.2026

B**B

Works great, strong hold

Used on machine door. Nice strong hold

13.04.2026

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HK$383

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered 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 Hong Kong.

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