Bollard height: 620mm; diameter: 55mm; pipe wall thickness: 5mm.（Comes with 3 screws + 3 keys) The column is made of cold rolled steel. Sturdy and practical. Comes with reflective, high reflective performance Exquisite craftsmanship, not easy to rust, uniform color, delicate and beautiful, enhance rust resistance The folding column can be flat to the ground for convenient use. Easy lift and fold down mechanism Warning bollards serve as barriers between roads, buildings, and parking spaces, alerting motor vehicles to their presence. Parking bollards, telescopic parking bollards, parking barrier posts with detachable bases, warning bollards.