Abstract: A safety device for preventing worker's from falling off of a peaked roof includes a boom pivotally connected to a rotatable stanchion. The rotatable stanchion is supported on the roof by a saddle which is adjustable to permit it to be mounted on various peaked roofs having different slopes. A tether is connected at one end for slidable movement along the boom and is connectable at the other end to the back of a worker's safety belt or harness in order to arrest movement or catch the worker in the event of a slip or fall. The rotatable stanchion and slidable tether give the worker a high degree of mobility on the roof and without interference with work or materials on the roof. A brake operable by tension in the tether arrests rapid sliding of the tether along the boom and a pair of shock absorber devices are provided to assist the brake in reducing any jolt if a falling worker is caught by the safety device.