it keeps your suspension springs in a compressed position so when you raise the vehicle the tire comes off the ground at once instead of remaining on the ground while you continue to raise the vehicle.
"Really?? how did you get that?? its an adaptor for a high lift jack to give better options for lifting points"
You are both right - it actually does both.
Now, the real question is -
Sue, young lady - what were you searching for that lead to a Jack Koff site????