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

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
Bright silver
Material
Neodymium
Product dimensions
40L x 14W x
Shape
Rectangular

📏Compact 40x13.5x5 mm size

🔩Countersunk hole for secure mounting

🧲20 KG pull force per magnet

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VT9990

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧲 Elevate your space with power and precision – don’t settle for weak magnets!

DURABLE METAL HOUSING - High-quality stainless steel casing protects magnets from damage and boosts adhesion.
PREMIUM INDUSTRIAL GRADE - Built with industry-standard neodymium for superior magnetic strength, heat, and corrosion resistance.
UNMATCHED MAGNETIC POWER - Each magnet delivers a robust 20 KG pull force, ensuring your items stay firmly in place.
PRECISION ENGINEERED SIZE - Compact 40x13.5x5 mm design fits seamlessly into any project or space-saving setup.
VERSATILE MOUNTING SOLUTION - Countersunk holes with included screws make installation effortless and secure.

Magnetpro’s 8-piece set of rectangular neodymium magnets offers a powerful 20 KG pull force each, housed in durable stainless steel with countersunk holes for easy mounting. Perfect for both household and industrial use, these compact magnets combine strength, resilience, and versatility to organize, secure, and innovate your space efficiently.

Specifications

ASIN	B08F54YGC9
Best Sellers Rank	5,395 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 53 in Rare Earth Magnets
Brand	Magnetpro
Colour	Bright silver
Country Of Origin	China
Customer Reviews	4.6 4.6 out of 5 stars (2,353)
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 Pieces	8
Pull Force	160 Kilograms
UPC	791258130419

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