Looking to make a wood magnetic kitchen knife rack. Would these be strong enough assuming a 2-3mm gap between magnet and blade of a 300g knife?

No, the penetration rate of the neodymium magnet is very low. It is recommended that you use two magnets each location and reduce the interval to 1mm or buy stronger magnets.

need to place on the inside of a 6mm glass window will they hold a 300 gram flat metal butterfly on the outside of the glass

Yes, this magnet can hold 500 gram with 6mm gap.

I've bought a pack, and they are all the same polarity. Can I buy some with the opposite polarity? (I want the magnets to attract each other)

The magnets will be very difficult to get apart from each other if they have opposite polarity. Please try to use a steel part to attract with the magnet.

Ordered item, but has never arrived almost 2 months on. Please can someone contact me to process a refund?

Contact Amazon Customer Service. Load Amazon page, scroll to the bottom and click on Customer Service at bottom right hand side

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Magnetpro 8 Pieces Rectangular Magnets 20 KG Force 40 x 13.5 x 5 mm with Countersunk Hole and Capsule, Household and Industrial Magnet with Mounting Screws

Product ID: 221609628

Details

Brand
Magnetpro
Colour
silver
Material
Neodymium
Product dimensions
40L x 14W x
Shape
Rectangular

📏40 x 13.5 x 5 mm size

🔩Countersunk hole with mounting screws

🧲20 KG pull force

€ 37.82

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧲 Elevate your space with magnetic mastery – don’t get left behind!

DURABLE METAL HOUSING - High-quality stainless steel casing protects magnets from damage and boosts adhesion.
UNMATCHED MAGNETIC POWER - Each magnet delivers a robust 20 KG pull force to hold your essentials securely.
PRECISION ENGINEERED SIZE - Compact 40 x 13.5 x 5 mm design fits seamlessly into any project or space-saving setup.
PREMIUM INDUSTRY STANDARD - Crafted with neodymium and corrosion-resistant materials for superior impact and heat resistance.
VERSATILE MOUNTING SOLUTION - Countersunk holes with included screws make installation effortless and professional.

Magnetpro’s 8-piece set features powerful 20 KG neodymium magnets in a sleek rectangular 40 x 13.5 x 5 mm form, encased in durable stainless steel with countersunk holes and mounting screws. Engineered for both household and industrial use, these magnets offer superior adhesion, corrosion resistance, and heat tolerance, making them the go-to choice for professionals and hobbyists alike.

Specifications

ASIN	B08F54YGC9
Best Sellers Rank	12,484 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 101 in Rare Earth Magnets
Brand	Magnetpro
Colour	silver
Country Of Origin	China
Customer Reviews	4.6 4.6 out of 5 stars (2,615)
Item Dimensions L x W x Thickness	40L x 14W x 5Th millimetres
Item Shape	Rectangular
Item Thickness	5 Millimetres
Manufacturer	Magnetpro
Manufacturer Part Number	MR40
Material Type	Neodymium, Stainless Steel
Model Number	ki106
Number of Items	8
Number of Pieces	8
Pull Force	160 Kilograms
UPC	791258130419
Unit Count	8.0 count

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