Portable/Movable Metal Pipe Bollard with Wheels. Movable Bollard provides a portable visual barrier when an area needs temporary protection. Ideal for use when keeping traffic out of a temporarily hazardous area or area under repair. Can be used indoors or outdoors. Mold-on-rubber wheels standard. Powder coated yellow for high visibility. Specs: usable height 42"; outside diameter 4 1/2"; wheel size 10".