The Removable Bollard Base bolts to your cement floor. Use with: BOL-RF-24-4.5, BOL-RF-36-4.5,BOL-RF-42-4.5,BOL-RF-48-4.5, BOL-RF-24-5.5,BOL-RF-36-5.5,BOL-RF-42-5.5, BOL-RF-48-5.5