Tiger Brand™ S301944PC Adjustable Temporary Shoring Jack™, 4"The Shore Jack offers a convenient and durable way to make structural repairs and functions as temporary support for various construction and remodeling projects. Fits a 4"x 4" timber post (3. 75"x 3. 75" ID), height fully retracted: 14 5 16", 4" screw adjustment fully extended equals overall height at 18 5 16". Transforms a nominal 4 x 4 lumber into a versatile adjustable post Recommended as a temporary or non primary support. Load capacity dependent