EARLY CONESTOGA WAGON JACK. This one has a very unique tapered cylindrical design with a sliding crossbar. Stands 18" tall...crossbar is 16 1/2" long and wooden base is 5 1/2" diameter at bottom. The very bottom of base has some deterioration. I can rotate screw about a half of a turn by hand but without securing the wooden base under a load or in a vise that is all I can turn it. You are buying as is