Welding Wire & Rod, Casters & Wheels, Rigging Supplies (Cable Wire Ropes), Markers, Gloves and much more. 10" x 3" Polyurethane on Cast Iron Caster (Red) - Swivel. 10" x 3" Polyurethane on Cast Iron (Green) - Swivel Top Plate: 4-1/2" x 6-1/4" Diameter: 10" Tread Width: 2-1/2" Load Cap: 2200 lbs Overall Height: 11-1/2" Axle Diameter: 3/4".