4PCs Parasol Base Stand Weights Umbrella Base Sand Water Filled Steel HDPE BlackFOUR PLATE SUPPORT: 4 plate base weight set with steel cross strongly supports your offset patio umbrella stand and ensure that it doesn't blow away in the wind. It's suitable for an umbrella with poles of 2" diameter. With the high bearing capacity, it can support a large double top umbrella. DOUBLE TWIST FIXED DESIGN: The two twist reinforces the stability of the umbrella that won' shake in normal wind conditions. DESIGNED FOR LONG TERM USE: Made of