Most extendable patio tables that support an umbrella use a hole about 2 inches in diameter (examples in listings show ~1.97"–2"). Some tables have an integrated hole; others include a removable hole cover for when you’re not using an umbrella.
Most sets require adult assembly. Whether tools are included varies by listing—some provide basic tools, others do not. For storage and space-saving, many sets offer stackable chairs or chairs that tuck under the table.
Many listings show seating for up to six people in the compact configuration, with several models extending to accommodate up to eight people when fully expanded.
Common mechanisms include flip-up or center panels (some flexible panels secured with buckles) and butterfly-style leaves. Some butterfly leaves are self-storing, folding and tucking under the tabletop for easier storage.
Many metal-frame sets have powder-coated or E-coated finishes and are marketed as weather-, water- or fade-resistant. Teak and other wooden sets are described as weather-resistant but commonly recommend periodic oiling and avoiding prolonged exposure to rain to preserve color and prevent cracking.