Unique Flatjack by Tri C Engineering - This jack measures only 1-1/2" high and fully extends to 6-1/2". Made of aluminum with a heat treated steel screw shaft. The Flat Jack will lift up to 1,000 pounds and the 5x13" base makes the Flat Jack Stable, yet easy to store. Any 7/16" socket can be used to raise the Flat Jack.