Telescopic cantilever storage racks are primarily composed of columns, movable support arms, control columns, link rods, and transmission mechanisms. Each layer can be manually extended outward via a hand-cranked transmission system, allowing materials to be accessed or stored using overhead cranes. 

The cantilever arms on each level can be independently extended manually, facilitating crane-based operations once deployed. This design ensures rapid loading/unloading, simplified operation, and enhanced accessibility.