These steel bollards can be used both indoors and outdoors to protect work areas, racking and personnel. They have a powder coated safety yellow finish. Molded rubber caps are removable. Base plate measures 8" x 8", on the 4.5, and include four (4) pre-drilled mounting holes. Mounting kits and replacement caps available. Welded steel construction. 42" H weighs 26 lbs.