This Strongway Quick Install Trolley with Lift Eye is an industrial-grade unit ideal for lifting and moving heavy cargo in a garage, warehouse or other worksite. This trolley is designed to adjust easily to the size of the beam via a manual screw mechanism. Similar to a beam clamp, the manual screw mechanism may also be tightened to prevent the trolley from moving. Fits 2-15/16in. 5-1/8in. flange width. Meets OSHA, ANSI/ASME B30.11 and B3017 standards.