Adjustable U-Heads Jacks scaffolding are designed to be used in conjunction with Adjustable System Scaffolding. The main function of a U-Head is to hold timber beams in securely in place. Adjustable jack head used cup lock standard in order to provide an additional maximum adjustment of length up to 300-600. The main application of U -Jacks is to hold MS Beams and channel in places, upon which the shuttering plates are placed during the construction.