This is a Manfrotto Alu Air-Cushioned Compact Stand Quick Stack 3-Pack. Each stand rises to a maximum height of 7.75' (2.3 m), and is air cushioned. Formerly known as a "Stacker", these stands now have what is called the QSS - Quick Stand System. When folded, these 3 stands may connected to each other to ease storage or transport.
Air cushioning protects fingers and mounted equipment. If the stand sections are not sufficiently tightened, mounted equipment eases down to minimum height instead of slamming down suddenly.
Versatile Top Spigot
Baby (5/8") spigot is topped with a 3/8" thread, that thread is topped by a removable 1/4-20" thread
Manfrotto 1052BAC-3 Alu Compact Stand, Pack of 3 - 7.75' (2.3m)