Dimensions: This umbrella base stand comes with two hand-turn tightening knobs to secure the umbrella to the base. Overall dimensions: 4.5"(L) x 4.5"(W) x 11.5"(H) Lightweight and durable: Designed to securely secure your patio umbrella. This product will leave more space for your deck or patio. Upgraded steel pipe: Deck mounted umbrella stand with thickened steel pipe, patio umbrella base stand resists bending and lasts for years, safely supports 50 lbs table umbrella, can be used in any weather conditions. Adjustment range This patio umbrella base comes with an adjustable hand-turn tightening knob, suitable for a variety of applications, can be adjusted according to the thickness of the umbrella post. Umbrella post diameter range: φ3.8cm-4.4cm. Easy to assemble: Clean and store, suitable for home and commercial use. Suitable for homes, villas, hotels, terraces, balconies, resorts, water parks, barbecue bars, western restaurants, beauty salons, outdoor leisure umbrella bases, umbrella bases, terrace umbrella bases, outdoor parasol bases, market umbrella bases, company leisure areas, company rest areas, etc.