Outdoor Umbrella Base and Stand Metal Clamp for Courtyard Balcony Posts Description: [Solid and Durable] The metal parts of the umbrella stand are made of durable iron, including knurled screws. There is a rainwater drainage hole at the bottom of the umbrella stand, so you don’t have to worry about the umbrella stand getting corroded and rusted by rain. [Simple installation] without tools, attaches to most railings, fences, stands, benches, tailgates, boats and more; [Saving space] Umbrella stand saves more space on terraces, terraces, gardens and other outdoor places, there are no more heavy and annoying umbrella bases on the terrace or patio. It is also portable, you can take it anywhere outside. [Use for] 1,5 inch inner diameter tube with knurled screws to hold umbrella securely, fits umbrellas with outer diameter less than 38mm. [Scope of application]Umbrella clamp is ideal for use on any corner surface, such as deck, stands, tailgate, boat, fence, etc. In addition to supporting the umbrella, it is also great for holding flags, torches, fishing rods or other poles, so it can also be used for fishing, picnics, parades, camping, outdoor work and so on. Specifications: Material: metal Size Chart: Length: 14.5 cm/5.71 inch Maximum hole diameter: 3.8 cm/1.50 inch The package includes: 1 piece Patio Parasol Clamp