Scissor jack for removing and installing a transmission from a car that's on jackstands, maybe in your garage or driveway... I used this jack once, to remove a heavy old cast iron overdrive transmission from an old Ford and to reinstall it. Used on concrete, and it worked great! It turned it into a one-person job, with no pulled muscles or smashed fingers! Used with common sense, following instructions, I found it to be quite safe. In original packaging and includes the user's manual. Originally bought at Harbor Freight new for about $140, so this is a steal at $75 (but for me it paid for itself with one use).