TRYMAG Ferrite Big Ring Magnet, Round Ceramic Magnets with Hole, OD2.36 x ID1.26 x 10mm, Large Magnets Heavy Duty for DIY, Science Projects Industria-Pack of 2

The best

Even though my 2003 Corvette is a GM product, the VXDAS GM relearn tool I purchased a little over a year ago will not work on my car. These huge magnets, only one of which is needed, by the way, worked immediately to reprogram the Corvette computer to recognize each tire's pressure sensor.Not to belittle the VXDAS tool, it worked flawlessly with my 2020 Chevy Equinox.

Low strength, but safe for kids to play with.

This is a fabulous product.

For picking up stray screws or nails. It has a strong pull.I added a string to drag.

I needed a strong magnet for holding a controller for a piece of equipment at work... these magnets worked great. Strong hold and because they are ceramic, I don't need to worry about rust. Great all around Magnets ... I can imagine a ton of different great uses for these!

As far as usefulness, these magnets are heavy and exert a lot of magnetic force. I use them to hold down various materials on a metal honeycomb laser bed. They do an amazing job keeping lightly warped 1/8" wood materials firmly pinned down. The only problem with them is that they are 1) far too expensive, and 2) somewhat fragile. You'll note in the second photo the edges are already starting to chip after only a couple of days of use. The chipping occurs when the magnets snap together - which they do with significant force. Sadly, I just can't picture these units lasting a long time.

I don't usually use ceramic magnets, but needed these for a project. They're impressively strong for the size. I wish they put spacers in the case because it's an effort to get them apart. Really good magnets. Will keep them in mind for my next project.