The easiest trolley installation ever½ to 5t installation and adjustment by rotating the threaded hanger shaft.10-30t installation from one side. Hanger shafts are fixed mounted to the opposite side plate.Trolleys up to 5t have a 5:1 design factor for use with powered or manual hoist. Trolleys 10t and greater have a 4:1 design factor and must be derated for use with powered hoist.Machined cast iron wheels with universal tread designed to fit flat or tapered beam flanges.Low headroom design with precision sealed “lubed for life” bearings assure smooth operation.Durable all steel construction with standard safety lugsGeared trolley hand chain comes standard with 20 feet of dropMeets: ASME/ANSl B30.16, OSHA, NASA-STD-8719.9, EU Directives: 2006/42/ECATEX rated ATEX certified II 3 GD c IIB 54º C X for limited use in Hazardous Environments