VEVOR Pallet Forks 42.9\" 4000 Lbs Max, Clamp On Tractor Bucket Forks with Adjustable Stabilizer Bar, Heavy Duty Front Loader Forks 58.7\" Total Length, Fork Attachment for Skid Steer, Loader Bucket

Here is the data information: Load Capacity: 4000 lbs / 1814 kg Overall Length: 58.7" / 1490 mm Fork Length: 42.9" / 1090 mm Fork Width: 3.9" / 100 mm Fork Height: 1.97" / 50 mm Adjustable Stabilizer Bar: 23.6"-45.3" / 600-1150 mm It cannot work with 5ft.

Yes.

Yes, they are compatible.

Yes,  of lifting capacity, and I had no problems. I also got these clamp on forks to move pallets and other things around our small acreage.

C-400LB are the higher quality made forks.