Trolley Trolley Type Push Maximum Load Capacity 2 400 lb Trolley Frame Material Cast Aluminum For Beam Shape Flat Tapered For Minimum Beam Flange Width 2 1/4 in For Maximum Beam Flange Width 7 7/8 in Headroom to Connecting Shaft 2 1/32 in Headroom to Mounting Point 1 3/16 in For Minimum Beam Height 4 in For Maximum Beam Height 4 in Includes Not Applicable Minimum Radius Curve 39 3/8 in Trolley Wheel Diameter 3 3/10 in Trolley Wheel Material Plastic