Crane Trolley Single End Truck With Kick Up Wheels See Description.Steel Plate Measures 10. 75." X 7. 500" 0. 250" Thick Hard Nylon (Phenolic?) Wheels Are 3. 250" In Diameter 0. 750" Thick Wheel Measurement From Outside Face Measures 10. 250" Center To Center It Is Approx. 7. 0313" Center Measurement Of The Kick Up Wheel Is Approx. 4. 500" Profile Detentions Are Approx. From Outside The Wheels Are 3. 500" Apart Inside Dimension Is 2" There Are (2) 1. 250" Diameter Hard Nylon Guide Wheels 8" Apart On The Center Two