Master Magnetics 07504 Retrieving and Holding Magnet, Durable Plastic, 40 lb, 2.375" Length, 2.375" Width, 0.75" Height with Eyebolt, Nuts and Magnetic Shields, Red/Black

First, I haven't tested the actual amount of weight this will lift, but anything like that will depend a LOT on the shape, thickness, and surface texture of the item you're lifting. But for my use, the specific number of pounds it will lift wasn't relevant. I bought this to use as a mount for a supplemental headlight on my garden tractor. It works perfectly for that purpose! The bare magnets could potentially scratch the hood, so I put down a thin piece of foam underneath. Even with that little space between the magnet and the hood, this has more than enough holding power to keep the light firmly in place through the vibration and bouncing of a tractor in use. In fact, I can't remove it by just pulling up - it lifts the whole hood of my tractor before the magnet releases. I have to grab the top of the headlight and tip the magnet at an angle to easily take it off. My headlight mount required the use of a bolt going down through the housing, and therefore of a nut inside the plastic housing. This was a little tricky, because the magnets on either side tend to pull the nut out of place. But if you get the right size nut (hint - I found that square works better than hex) the sides capture the nut, so once it's started you just have to tighten the bolt and the nut is nicely held in place. One note, to address a different review I saw - if this seems extremely weak, remove the plastic covers! It ships with some sort of sliding guards that apparently keep it from sticking to other packages, or the UPS truck shelf, or whatever. With these guards in place, there is a VERY weak magnetic pull. But once they're removed, it's a very strong magnet. This is just what it says - a heavy-duty magnet in a fairly durable plastic enclosure with useful mounting holes. Useful for a variety of things besides "retrieving".

I use this magnet as a tool in knifemaking to hold the blade during grinding, so my review may or may not be applicable to you. I work with stainless steel and this magnet performs wonderfully. It is every bit as strong as I would want it to be and probably a hair stronger than it needs to be, however that is hardly a negative. Be careful where you set it down- if you lay it magnet side down on a steel surface you may have to work to pull it off. Even on a blade, I have to lift one side to break it free. Pulling it off squarely probably isn't going to happen with your bare hands. For knifemakers out there (for whom this magnet is very popular) I use a layer of blue painter's tape on the magnet surface: 1- because the metal filings come off with the tape, so cleaning the magnet is super easy, and 2- if you have to slide the magnet some to break it free it greatly reduces scratches in the steel. The design is very good for my purposes. The magnets are oriented to one side, so laying it down on its back (magnets up) causes no issue with picking it up. The plastic body is a great heat insulator. It's also great that I can dunk the steel in water without taking off the magnet. The magnet has no steel body to rust like other lifting magnets I have. It says 100lb lift. That's debatable, but it's certainly a powerful magnet. The shields that come with it work very well, so you can chuck this in your toolbox without worrying about getting it out again or magnetizing things you don't want magnetized.

I purchased this magnet for my chicken coop - to scan the ground for any dropped nails, screws, staples etc - after some construction out there. In foraging, if the chicks found & swallowed a small screw, staple etc - it could kill them. Before I used the magnet, I raked the area well, until the ground was clear, and it all looked fine... however - when I tied the magnet to a string - and swung it like a pendulum - over the ground -this magnet quickly grabbed things out of the soil I hadn't seen. I heard clink after clink as the magnet drew 17 assorted size screws, a whole bunch of staples and bits of staples, and 2 tiny, brown rusted drill bits - up out of the ground!!! This magnet is SUPER STRONG! Also works great after the farrier has shoed the horse, and easily finds any dropped farrier nails. I like the black covers on the magnetic bars - because they cover the bottoms of the magnet, so it can be put away and stored - without being magnetic. It's a great tool to have at a very fair price.

This is an awesome, powerful magnet! We used it for magnet fishing off a small dock at a local reservoir with a spool of tarred line I also bought on Amazon. We pulled up some fishing hooks and iron filings but we kept getting the dock mooring cable too. Of course we were hoping for a treasure chest or maybe a ditched revolver from a bygone bank robery, but no dice. This thing is so strong I thought we would break the line trying to get it free of the cable. Ultimately, we lost it not because the line snapped but because the screw eye does not completely form a closed loop and I think the line slipped through that small gap. We'll try again when we can think of a way to overcome that issue, probably use a carabiner. Still, I think this is a great product. Gave 4 stars because of the screw eye. Hi

It was too small. But didn’t want to go to the hassle of sending it back.

The magnetic field does not extend very far from the ends of the magnet. It comes with covers, each about 1/4 inch thick, to cover the magnet faces - and they do, in fact, cover about 90% of the palpable field surrounding the magnet ends. I suspect that the magnet could lift 100lbs if the object is was lifting was a solid block of ferrous material that weighed exactly 100 pounds and in the perfect shape to be captured entirely by the magnetic field. I bought this magnet to fish for nails when I'm metal detecting - I had hoped that just getting the magnet within a few inches would be enough to attract the nail. Unfortunately, I found that the nail has to be closer than 1/4 inch in order to be picked up by the magnet. I think that watching too many Road Runner cartoons severely skewed my perception of what magnets are capable of.

We purchased this product to keep birds away from out Cat feeders …. works like a charm. Now we only have a few small sparrows that we don't mind.

I bought this for magnet fishing, I haven't used it yet, it's been sitting on a table for over a year but it is a very strong magnet once you remove the magnet cover.

I can't give a higher star rating until I have used it. But I am. looking forward to it

I am very impressed with the strength of the magnet. One of the hinges of the oven door of my stove is broken and it couldn't close properly, so I use the magnet to secure the door.

As described, good magnet