The clamping bolts are connected indirectly through the clamping surface to prevent damage to the parasol. For balcony, patio, swimming pool, bleach, benches, tailgates, boats, poles, fences and more. Flexible design: The umbrella holder clip is suitable for umbrella poles with a diameter of 5 cm. Easy installation: the umbrella clamp clip can be quickly mounted on the railing and the position can be changed. Quick installation, quick release. Space saving: thanks to the attachment to the balcony railing, you have more space for flowers on the balcony. Durable material: made made of galvanized steel, solid, and can be used for a long time.