The ScaffoldMart Scaffold Leveling Jacks go in the bottom of scaffolding frames, providing base plates that are height adjustable. This means that each leg's height can be set independently to perfectly level a configuration. These are our Ultralight versions, with hollow rods to save weight. These jacks provide about 18 in. of adjustability to a configuration, and feature 5 in. x 5 in. plates at their bases. Make easy work of lifting by having these leveling jacks in your garage or workshop.