Rolling bookshelf carts commonly range from about 24 inches up to 65 inches tall and from roughly 5 inches to 28 inches wide, so you can find very slim pull-out carts as well as wider three-tier units.
Common finishes include powder-coated and chrome-plated metal, black metal combined with natural wood tops, and wood-color options such as modern white, walnut, and natural wood—used on rotating shelves and other styles.
Typical safety features include anti-tip anchoring hardware to secure taller units to a wall or floor and lockable caster wheels (wheel locks) to keep units stable and prevent unintended movement when bumped or during transport.
Most include caster wheels or swivel bases for easy movement; many models offer smooth-glide casters and lockable wheels, while some towers provide a 360° rotating base and options for optional or lockable wheel installation.
Assembly requirements vary by model. Many require adult assembly; some advertise tool-free or no-tools-required assembly, while others expect basic tools (either provided or not provided) — check the product listing for the specific model's instructions.