Guardian Retractable Horizontal Lifeline** This item requires 2 carabiners for attachment. If you don't have approved carabiners, we recommend 2 qty of the Guardian 3 4" Gate Double Locking Carabiner * This horizontal lifeline is user friendly and installs in minutes. * The retractable horizontal lifeline supports up to two (2) workers in fall arrest, and up to four (4) workers in fall restraint. * The temporary installation means this unit is usable in a wide variety of industries. * The