For steel bars of various lengths, they can be categorized and stored on different cantilever levels. Typically, a set of telescopic cantilever shelves features double-sided telescopic cantilevers, multi-layer design, with ten to several storage bays. Each bay can hold up to 2-8 tons, allowing for whole bundles to occupy a single bay or a mix of materials in one bay. To differentiate, separators can be added to the bays, enabling them to be categorized as well. Different specifications of materials have designated storage bays. The shelves have a high load capacity and are easy to operate safely. Both manual and electric options are available, and even manually, workers can operate with ease using just one hand without any exertion.