Abstract: A safety device for steelworkers. The safety device is adapted to be slidably secured about a flanged beam to attach a lifeline to workmen and to secure the workmen against falls. The safety device includes an elongate, preferably bar member having a plurality of apertures therethrough, and first and second L-shaped jaw members suited for clamping about the flange of the beam. The second L-shaped jaw member is slidably affixed to the elongate member by a slide housing attachment portion which includes a barrel portion which allows the elongate member to slidably pass therethrough in a close fitting relationship. The second L-shaped jaw member also includes at least one aperture through the barrel portion. A locking pin is provided which passes through any one of the plurality of apertures in the elongate member, and, and through the barrel portion of the slide housing attachment portion.