Feature: 1. ADJUSTABLE DESIGN: Patio heavy duty umbrella bracket is suitable for up to 2 inch table or offset umbrella poles. By tightening the 4 fixed knobs on the patio umbrella holder to adjust the hole diameter. Can be firmly fixed on the balcony railing and bench, etc. 2. WINDPROOF DESIGN: The patio umbrella stand provides better stability, and the umbrella holder stand have sturdy full welding line, which are not easy to break. So your patio umbrella can stand stably in the wind without moving or rotating. 3. METAL MATERIAL: Made of premium carbon steel material with a black coated finish, that makes umbrella holder bracket water proof and rustproof, and the deck umbrella bracket provides exceptional stability and durability. 4. EASY INSTALLATION: The umbrella clamp can be quickly installed, come with 8 wood screws which can firmly fix the base on the wooden post. Suitable for mounting on deck railings. 5. SPACE SAVING: This umbrella stand outdoor is an must have bracket for use on deck railings. Great for using it on any corner or surfaces like decks, bleachers, tailgates, boats, fences, etc. Specification: Item Type: Patio Umbrella Holder Product Material: Carbon Steel Size: Approx. 10.1x6x7.6cm / 4.0x2.4x3.0in Gross Weight: 1105g/2.4lb. Package List: 2 x Umbrella Holder8 x Screws4 x Knob Screws Note: All data are measured manually, and there are certain errors in the measurement results.