Sealed knob design for secure anchoring: The sealed knob design fixes the base inside the bottom of the umbrella, greatly improving stability. This helps prevent the umbrella from tipping or being blown over in windy conditions. Easy fill spouts and lifting handle: The base features fill spouts for quick filling with water or sand. A handle at the bottom allows easy lifting, so you can move the base to a position without effort. Sturdy 4 plate design with interlocking pins: Four interlocking plates lock the umbrella base securely in place. This design provides stable support on a variety of ground surfaces, including grass, sand, and concrete. weight capacity for strong anchoring: The base can be filled with up to 52 kg of water or 72 kg of sand, delivering a solid anchor for offset umbrellas and protecting them from falls and harsh weather. Use scenarios Home backyard on grass: Place the base under an offset umbrella to create a stable shade area for outdoor dining or relaxation without worrying about wind. Beach or sandy area: Fill with sand to securely anchor the umbrella on the beach or dunes, ensuring steady shade during seaside activities. Outdoor café or patio on concrete: Move and reposition the umbrella as needed for flexible seating arrangements on a concrete patio, while maintaining stable, windresistant support.