Item Description Create a strong foundation for your patio umbrella with this fillable umbrella base. Fill with water or sand for a strong and stable base. Empty it for easy lightweight storage. The adjustable tightening knob accommodates most umbrellas and locks them in place even during high winds and rain. The Circular base provides stability and style for your deck, garden, or patio. Item Dimensions 13.78" H x 20.1" W x 20.1" D Neck Diameter 2.17" Base Height 4.73" Base Diameter 20.08" Hole Diameter 1.50" - 1.89" Item Specifications Fill with water or sand for a strong base Adjustable Tightening Knob Weather Resistant, Durable, and easy to maintain High-Quality Plastic Material Simple Storage Lightweight when empty Easy to Assemble Additional Details ------------------------------ Bullet point: (STABLE BASE) This umbrella base includes an adjustable tightening knob to secure poles of various sizes. The knob ensures a snug fit, preventing wobbling or movement, even in windy conditions. Its precise design provides reliable stability, making it ideal for outdoor use. Product description: Item Description Create a strong foundation for your patio umbrella with this fillable umbrella base. Fill with water or sand for a strong and stable base. Empty it for easy lightweight storage. The adjustable tightening knob accommodates most umbrellas and locks them in place even during high winds and rain. The Circular base provides stability and style for your deck, garden, or patio. Item Dimensions 13.78" H x 20.1" W x 20.1" D Neck Diameter 2.17" Base Height 4.73" Base Diameter 20.08" Hole Diameter 1.50" - 1.89" Item Specifications Fill with water or sand for a strong base Adjustable Tightening Knob Weather Resistant, Durable, and easy to maintain High-Quality Plastic Material Simple Storage Lightweight when empty Easy to Assemble