We increased the base thickness from 2.5 mm to 4.1 mm and added four reinforced triangles, making this deck umbrella mount virtually indestructible-even in hurricane conditions.The two lengthened fixing knobs, four expansion bolts, and four hexagonal screws are all made of premium stainless steel. This ensures no rusting screws-even when the bracket itself stays rust-free outdoors.A specially added module secures the bottom of the umbrella handle, while three PVC pipe sleeves (1.24", 1.56", and 1.96") provide extra stability. Together, they keep the umbrella from shaking-even on windy days.Unlike hollow-bottom designs that trap moisture and cause handle rot, we sealed the base and reserved only a drain hole-perfect for wet ground conditions. Color: Black. Material: Metal.