Outdoor umbrella base and stand metal clamp do balcony posts in courtyard Description: [Solid and durable] Metalowe umbrella stand parts are made of durable iron, including knurled screws. There is a do 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 do most railings, fences, stands, benches, tailgates, boats and more [Saving space] Umbrella stand saves more space on terraces, terraces, gardens and other outdoor places, no longer ma 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 do hold umbrella securely, fits do umbrellas with outer diameter less than 38 mm. [Scope of application]Umbrella clamp is ideal do use on any corner surface, such as deck, stands, tailgate, boat, fence, etc. In addition to supporting the umbrella, it is also great do hold flags, torches, fishing rods or other poles, so it can also be used do fishing, picnics, parades, camping, outdoor work and so on. Specification: Material: metal Size Chart: Length: 14.5 cm or 5.71 inch Maximum hole diameter: 3.8 cm or 1.50 inch The package includes: 1 sztuka Patio Umbrella Clamp