Fangrui Product Details Thickened Base: The Base Thickness Directly Determines The Stability Of The Outdoor Umbrella, Especially In Windy Weather. We Increased The Base Thickness To 4 Mm, Which Is Much Stronger Than The 2.5 Mm Thickness Commonly Used In The Market. Even The Accessories Are Stainless Steel: The 4 Fixed Knobs And 8 Screws Are Made Of Premium Stainless Steel, Which Completely Avoids The Embarrassment Of Rusting Screws While The Patio Umbrella Stands Are Not Rusty In The Outdoor. Sturdy And : High Quality Stainless Steel Material Plus Thickened Powder Coating Makes Our Heavy Duty Umbrella Clamps Easily Cope With The Harsh Outdoor Environment Without Rust And . And We Provide You With An Ultra-long , Please Rest . Space Optimization: If You Dont Want To Use A Heavy Patio Umbrella Stands Or Base, And Maximize The Patio Space And Provide Shade, Our Patio Umbrella Holder Is Your Alternate, And Our Bracket Can Be Mounted On Vertical Railing At Any Position. Note: Due To Different Production Batches, The Screw Colors Are