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.

Rb50cx6 | Desertcart Greece

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€ 47.77

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧲 Power your projects with magnetic mastery—grab yours before they’re gone!

TRUSTED SINCE 76 - Master Magnetics delivers proven quality and performance, empowering pros and DIYers alike.
VERSATILE MOUNTING HUB - Precision 0.197" center hole lets you customize with hooks, knobs, or eyebolts effortlessly.
UNMATCHED HOLDING POWER - Each magnet grips with a robust 35 lb pull force—no slip, no fail.
BUILT TO BRAVE THE ELEMENTS - Nickel-plated ceramic design resists corrosion and withstands up to 400°F—perfect indoor/outdoor companion.
PRECISION ENGINEERED FOR RELIABILITY - Crafted with diamond-ground finish and sintered at 2,000°F for consistent, long-lasting magnetic strength.

Master Magnetics Ceramic Round Base Magnets offer heavy-duty 35 lb pull strength in a sleek, nickel-plated ceramic design. Featuring a 0.197" center hole for versatile mounting, these magnets resist corrosion and heat up to 400°F, making them ideal for both indoor and outdoor use. Precision-engineered and trusted since 1976, this 6-pack is perfect for professionals and DIY enthusiasts seeking reliable, powerful magnetic solutions.

Specifications

ASIN	B00IYFNXR0
Best Sellers Rank	#3,834 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #35 in Magnetic Hooks #1,690 in Hardware
Brand	Master Magnetics
Brand Name	Master Magnetics
Customer Reviews	4.4 out of 5 stars 750 Reviews
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	0.27 g
Manufacturer	Master Magnetics, Inc.
Material	Ferrite, Low carbon steel
Material Type	Ferrite, Low carbon steel
Model Number	RB50CX6
Number of Items	6
Number of Pieces	6
Part Number	RB50CX6
Product Dimensions	2.04"L x 2.04"W x 0.3"Th
Pull Force	35 pounds
Shape	Round
UPC	095421006755
Unit Count	5 Count

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