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.

Master Magnetics Round Base Magnet Fastener With 0 197 Center

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

HEAVY-DUTY MAGNET PACK: With a 35 lb pull strength, these ceramic round base magnets deliver serious holding power. They are ideal for securing heavy items in homes, workshops, and commercial spaces.
VERSATILE APPLICATIONS: These round magnets feature a 0.197" center hole for easy pairing with various fasteners like hooks, knobs, or eyebolts. The strong magnetic base mounts lights, signs, antennas, and more with ease.
BUILT TO LAST: Ceramic magnets resist corrosion and won't wear down. Our magnets withstand temperatures up to 400°F and have a nickel-plated finish for extra protection, making them ideal for both indoor and outdoor use.
HIGH-QUALITY CONSTRUCTION: Crafted from strontium carbonate and iron oxide, our ceramic (ferrite) magnets are molded, sintered at 2,000°F, precision-ground with a diamond wheel, magnetized, and carefully inspected to ensure reliable performance.
MASTER MAGNETICS: We are a USA-based company trusted since 1976 for strength, quality, and performance. Our extensive line of affordable, powerful magnets makes tasks easier in homes, workshops, and industrial spaces.

Whether you're a professional contractor, a handyman, or simply looking for an effective and convenient way to organize your space, the Master Magnetics Ceramic Round Base magnets are the ideal choice. Ceramic magnets are affordable and permanently magnetized, making them a practical choice for applications that require a reliable magnetic attachment. Their sleek nickel-plated design, robust holding power, and thoughtful construction make them efficient solutions for various applications. Say goodbye to clutter and disorganization with this pack of powerful magnetic fasteners.

Specifications

ASIN	B00IYFNXR0
Best Sellers Rank	#2,645 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #28 in Magnetic Hooks #1,100 in Hardware
Brand	Master Magnetics
Brand Name	Master Magnetics
Customer Reviews	4.7 out of 5 stars 2,796 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	0.01 Ounces
Manufacturer	Master Magnetics, Inc.
Material	Ferrite, Low carbon steel
Material Type	Ferrite, Low carbon steel
Model Number	RB50CX6
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	5.0 Count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

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TrustScore 4.5 | 7,300+ reviews

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Master Magnetics Round Base Magnet Fastener with 0.197" Center Hole Chrome Plate, 2.04" Diameter, 0.302" Thick, 35 Pounds, Silver (Pack of 6), RB50CX6

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