Knight 7500 Series Aluminum Bridge Crane System.System was removed in working condition no hardware is included System was set up with 1 bridge with push trolleys.2000 Lb bridge capacity, 2500 Lb runway rail capacity. Capacity will vary based on your specific set-up.RAD7500 Rails. 4" Inside width. 8" height.Includes the following sections: Current Configuration(2) Bridge Rail: 9' lengthTotal of (14) runway rails: (12) 25' Length(2) 19' Length