Double-lock design: comes with 2 hand knob tightening screws with rubber tips to prevent scratching that hold the umbrella pole securely Adequate capacity: providing up to 60 pound (27kg) weight to your parasol with water and sand filled (not included) Universal function: adjustable holder to fit 1.3"(32mm), 1.5" (38mm) and 1.9"(48mm) diameter poles, suits 7-11 feet market parasol umbrellas Durable material: made of high-density HDPE plastic and anti-rust steel pipe for all weather resistant and sun protection Multi-scenario use: applying for many leisure scenes like patio, deck, yard, garden, porch, balcony, swimming pool, lawn, outdoor cafe, restaurant, etc Helios&Hestia 60 lb Heavy Duty Round Umbrella Base, Plastic Water and Sand Fillable Outdoor Stand Weight for Patio Market Table Umbrella, Black