3M I-Beam Trolley, 3 in to 8 in W Flange, Up to 11/16 in Thickness, 310 lb Load Capacity, Clamp Attachment (098-2103143)
Installs onto 3 inch to 8 inch wide I-beam flange (7.6 cm to 20.3 cm) up to 11/16 inches thick (1.7 cm) Complete hands-free horizontal mobility Ideal for use with self retracting lifeline Easy to use dual adjustment dials