SKYPRO1 Pack Rectangular Neodymium Bar Magnets, Rare Earth Magnets For Multi-Use, Fridge, Crafts or DIY (100x10x5mm)

Very powerful, I mean once you get it attached to something, it will be VERY HARD to get it off. I had to use a hammer to get it off! This is one strong magnet.I use it for a weird purpose: as part of trying to install a running board on my SUV, I dropped one of the holding bolts into a part of undercarriage that is SEALED - so there is no way to retrieve that bolt! After suffering weeks of rattling bolt every time I accelerate and decelerate, I went NUTS. I had to do something about it, it was driving me crazy. Tried a bunch of different things to retrieve the bolt, but without cutting thru metal on my expensive SUV, there seemed no way. Then finally it hit me! I could buy a strong magnet and fish out the bolt closer to the tiny entrance [thru which it fell in the first place]. But that proved very hard too (because the undercarriage is also made of magnetic material - aka iron :). So I decided to leave the magnet in hopes that that would hold the bolt in place. That finally helped - once the bolt rolled itself into position (that took a week of rough driving, lol), the magnet did its job and held the bolt in place - the rattle is finally gone! I might buy a few more of these and put them a few inches apart to keep the bolt from ever escaping the death grip of magnetism!

All of the magnets together did not measure half an inch COMPLETE WASTE OF TIME USELESS SAVE YOUR MONEY

Great bit of kit ! will get more ! so many uses

Very good