Features Perfect for umbrellas with a diameter between 32 and 60 mm Made of weatherproof and rust-proof aluminium Two locking screws ensure the perfect hold of the umbrella Inner protective strip protects the lower tube of the umbrella from scratches The ground sleeve comes with reducing ring set. Product DescriptionDoppler aims to offer customers many high-quality products and satisfy the needs of all customers. To achieve this, Doppler spends more time on the development and design of the products. In our store you will find more and more classic, fashionable, fun products. We want to be a high quality seller on Amazon who always offers high quality products.