When I looked at these I was a bit sceptical on them. How ever I bought them and when they were delivered in great shape I may ad. I put them on my tractor that has a 50HP motor and 72\" Bucket. I had a slab of concrete that needed moving. It was 6 inches thick and 6 ft. x 8 ft. It was very heavy but I was able to move it with it about 3-5 inches off the ground. I would think that this slab weighed more than 4000 pounds. But these forks didn't bend. They saged a bit but recovered when I backed up. These forks were not meant to do this kind of work but they did. Yes I would recommend them but not for doing what I did.