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: 14230282

Details

Brand
Master
Item Thickness
0.3 Inches
Material
Ferrite Low
Product Dimensions
2.04"L x x
Shape
Round

💪35 lb pull strength

🌡️Withstands up to 400°F

🛠️0.197" center hole for versatile mounting

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Description

🧲 Power up your projects with magnetic mastery!

TRUSTED SINCE 1976 - Master Magnetics combines decades of expertise with affordable, powerful magnets that elevate your workspace organization.
UNMATCHED HOLDING POWER - Each magnet delivers a robust 35 lb pull force, securing your heaviest projects with confidence.
VERSATILE MOUNTING OPTIONS - Precision 0.197" center hole lets you easily attach hooks, knobs, or eyebolts for customized setups.
BUILT TO BRAVE THE ELEMENTS - Nickel-plated ceramic magnets resist corrosion and endure temperatures up to 400°F—perfect for indoor and outdoor use.
PRECISION ENGINEERED FOR RELIABILITY - Crafted from premium ferrite materials and diamond-ground for consistent, long-lasting magnetic strength.

Master Magnetics Ceramic Round Base Magnets offer heavy-duty 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 ideal for both indoor and outdoor applications. Trusted since 1976, this 6-pack delivers reliable, precision-engineered magnetic solutions for professionals and DIY enthusiasts alike.

Specifications

ASIN	B00IYFNXR0
Best Sellers Rank	#2,169 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #21 in Magnetic Hooks #907 in Hardware
Brand Name	Master Magnetics
Customer Reviews	4.7 4.7 out of 5 stars (2,809)
Global Trade Identification Number	00095421006755, 10095421006752
Included Components	Magnets
Item Dimensions L x W x Thickness	2.04"L x 2.04"W x 0.3"Th
Item Thickness	0.3 Inches
Item Weight	0.01 Ounces
Manufacturer	Master Magnetics, Inc.
Material Type	Ferrite, Low carbon steel
Model Number	RB50CX6
Number of Pieces	6
Part Number	RB50CX6
Pull Force	35 Pounds
Shape	Round
UPC	095421006755
Unit Count	5.0 Count

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