Fowler 52-104-000-0 Screw Jack set with 1000lbs capacity. It has a range of 2.25"-3.375" before extension use. Jack base diameter is 1.25". Extension bases, 1" and 2", can be combined. This jack set includes Screw Jack, two optional bases, 1 " extension, 2" extension, Locking bar and optional support. With the weight capacity of 1000 pounds the bases can be stacked and combined for cylindrical applications or narrow edges and slots. Adjustable with the pivotal top or a single contact point extension. All in a shop hardened case with a full one year warranty offered by Fowler, an American company. If you experience any problems contact Fowler directly for warranty claims.