Adjustable Trolley with Safety Plates, 4000 lbs. (2 tons) Capacity, 3-15/16" - 5-14/16"Easily adjusts to fit various flanges, I beams and H beams Use on straight or curved track Can be installed or removed at any position on the beam Heavy duty cast iron wheels Deep width flange provides superior contact with the beam Safety plate included Geared trolleys include two geared wheels operated by hand chain Meets ANSI B30. 11 Capacity: 4000 lbs. (2 tons) I Beam Flange Width: 3 15 16" 5 14 16" Manufacturer's Warranty: 1 Year Limited Net