Key benefits and features - Secure umbrella fixation: Two adjustable tightening knobs clamp the umbrella shaft securely. An interior hole and exterior knob work together to fix the umbrella firmly to the base. - Heavy and portable ballast options: Base can be weighed down with up to 50 pounds of sand or water for stability, and can be easily transported when emptied. Note: Water and sand are NOT included. - All weather durability: Made from rugged HDPE plastic with a steel pipe. The base resists weathering and corrosion, helping the pole stay steadier in wind and light rain. - Broad compatibility and easy setup: The base is designed to accommodate various umbrella sizes. The plastic insert on top of the steel tube fits umbrella poles with a diameter from Φ1.5" (38 mm) to Φ1.9" (48 mm). To use, insert the umbrella pole into the base and tighten the knobs. - Practical placement guidance: Suggestion to use the base with a patio table for added stability and convenience. What it is and how it works - Construction and materials: Rugged HDPE plastic base with a steel pipe. All-weather resistant and corrosion-resistant, delivering lasting sturdiness for your umbrella. - Fixation method: Two adjustable turn knobs provide a secure clamp. The design includes an inner hole and outer knob to hold the umbrella shaft firmly in place. - Size and compatibility: Top plastic insert supports umbrella poles in the range of Φ1.5" (38 mm) to Φ1.9" (48 mm). The base is suitable for a variety of umbrella sizes. - Versatile ballast: Fill with up to 50 pounds of sand or water to weigh the base down. When not in use, it can be emptied for easy transport. Easy assembly and use - Simple setup: Insert the umbrella pole into the base and tighten the two knobs to secure. - No leakage or complicated parts: The design focuses on straightforward assembly and stable performance. Use scenarios - Residential patio dining area: Place the base at a table edge to provide stable shade for outdoor meals without wobble. - Poolside or deck: Use as a stable anchoring point for a floating umbrella to resist breezes near water. - Garden or yard lounge spots: Set up multiple bases to shade seating areas along paths or near seating arrangements, using the ballast option for stable ground placement. Maintenance and care - Material and durability: HDPE base and steel tube offer long-term durability in varying weather conditions. Wipe clean as needed. - Handling water and sand: Do not rely on water at or below 32F in freezing conditions to avoid cracking. Water and sand are not included and should be added as ballast as needed for stability. Specifications at a glance - Ballast capacity: Up to 50 pounds (sand or water) - Pole compatibility: Φ1.5" (38 mm) to Φ1.9" (48 mm) - Materials: HDPE plastic base, steel pipe - Assembly: Insert umbrella pole into base and tighten two knobs - Use with table: Recommended option to improve stability and convenience Note - Water and sand are NOT included. Use the base with a patio table for added stability if desired. Do not fill with water at or below 32F to prevent freezing and cracking.