Steel Pipe Bollard With Chain Slots Create barriers around workstations, machinery, and outdoor space. Ideal for indoor and outdoor applications. Easy to  assemble. Series BOL-JKS has a removable black rubber bolt-on-steel top cap with socker set-screw. Place chain into chain slots, storing any excess chain inside the bollard, and place cap back onto bollard. The chain slots hold chain connected to other bollards. Base plate includes four pre-drilled mounting holes. Heavy duty welded steel construction. Powder coat safety yellow finish. Specs: Removable Rubber Cap, 4-1/2" Dia, Heights 24", 36", 42", and 48".