Adjustable base jack we deal in is provided with a specific diameter. It has a nut restraint for ensuring the minimum engagement of the stem. This is made to accepting twin 100mm wide bearers. The main function is to hold timber beams in a strong way. Adjustable base jack is used for supporting centering sheet and beam bottoms. The adjustable span of this product is assembled with inner sliding and outer sliding. As per the need it can be accordingly adjusted. This is extensively used support floor forms of low maintenance cost. It is provided with a jack nut that enables for an accurate adjustment.