Magnetic Lifter, 3300lbs/1500kg Pulling Capacity, 2.5 Safety Factor, Neodymium & Steel, Lifting Magnet with Release, Permanent Lift Magnets, Heavy Duty Magnet for Hoist, Shop Crane, Block, Board

I was a little skeptical after reading some of the reviews. The price was right so I took a chance. I took this to work and attached to overhead crane, and attached to a 7 inch diameter by 39 inches long 4140 round stock weighing about 400 pounds. I raised the hoist and picked up the part about an inch off the pallet and gave the chain a good shake! This magnet held securely. I suspect some people were trying to pick up objects that were too thin, thereby losing maximum penetration. The chart does show about 1 inch thickness or more for best penetration. The guide does show that round stock will lose some advantage between 30% and 50% compared to flat stock. My demonstration performed better than that. Of course you should never trust any magnet completely, even after giving a good shake, I still would not put my hands or feet in path of danger. So please---- Always Be Careful! Hope this helps.

welded a clamp to it hold down metal on the center of mywelding table

I bought this to lift 4 x 8 sheets of 11 gauge steel. While the clamp sticks well but once you start to lift the material it pops off even though it is well under the weight limit of the clamp. Maybe more clamps would fix the issue.

I use this to lift 1/4. 3/8. 5/16. 3/4 and one inch thick of 4 x 4 sheets of steel. Works like a charm. Once you flip the lever to on it is on and not coming off

Doesn’t pick up lbs as stated everything needs to be perfect to work situated right it works good on half of rated lift capability