【Q235 STEEL 36INCH HIGHT】- This safety bollard is made of Q235 steel with high hardness, great strength and durability. Welded and integral structure enables the bollard post withstand the impact. Height: 36 inches / 91.4 cm..【YELLOW FINISH 4.5INCH O.D.】- The powder coated finish protects the parking bollard from oxidation and fading or rusting. The black and yellow top enhances great visibility. Pipe out diameter: 4.5in/11.4cm. Pipe thickness: 0.12in/3mm..【STABLE BASE PLATE】- The steel pipe safety bollard adopts sealed bottom design, increasing the grounding area. The base: 0.24in/6mm thickness, 7.87 x 7.87in/20 X 20cm (L X W), more stable and durable. No need to worry about sand or cement oozing out the bottom..【EASY INSTALLATION】- This yellow bollard comes with 4 anchor bolts that are easy to install in the base plate which includes 4 pre-drilled mounting holes. Assembly takes you low energy and time..【VARIOUS APPLICATION AND GUARANTEE 】- This steel bollard stands vertical to provide increased visibility and protection to entrances, parking lots, sidewalks, bike paths, and more. Commonly used in traffic-sensitive area.We COTTEEAMY are committed to provide excellent customer service,If you have any questions,please contact us.We will try our best to solve your problem.