The Trylon 4.99.0202.611 stand-off universal mount for round legs is ideal for retrofitting older towers and step-bolt towers with fall arrest. Each unit includes all required mounting hardware. Does not include stand-off bracket. The 4.99.0202.611 is designed to work with towers with legs between 3 ¼-in and 6 ½-in.BRBRThe stand-off bracket, Trylon part 4.99.0204.000, is ordered seperately and is used to hold the fall arrest cable as it runs up the tower. Each stand-off universal mount requires one (1) stand-off bracket.