This 2-user, galvanized steel vertical safety system (vertical lifeline) meets the new ANSI Z359.16 standard, along with OSHA 1910.140 and 1926.502, when used with the Lad-SafX3 Detachable Cable Sleeve (6160054) and Lad-SafX2 Detachable Cable Sleeve (6160030) and is ideal for billboards and ladders. The Climbing Extension extends 4 above the top attachment point.