4" Silver with Bracket groove wheel V-Groove Gate Wheel for Sliding Gates 4 inches for V-profile tracks Compatible with Aleko and most V Track Manufacturer no maintenance needed Comes with bearing for In-verted profile tracks suitable for flat mounting under the gate Designed for loads up to 800Lb (350kg) Never needs greasing or maintenance as the bearings are sealed Diameter: 4 inches High quality engineered COLD ROLL STEEL 4 inches (100mm) wheel in housing