Don't know how the jack could work this well @ this price. Tried everything the minute it came in, not expecting much. It picked up a 5000# machine in the shop & didn't even whimper. One of my guys welded a 2" square tube a little crooked. Took the jack & used it as a porta power to straighten the piece. One quarter wall tube doesn't move that easily, but the jack straightened it without a pause. Didn't like the battery adapter, (my opinion only), so I replaced it with a plug to fit our 12 volt source. Other than that, really pleased. Time will tell how long it will last. Hopeful.