Internal Gate Castor Recessed Gate Track Wheel 88mm GTR004Mounts recessed into the bottom of the gate for a low gate profile. C Groove profile to suit GTR010 gate track. Gold zinc plated wheel and housing. Double bearings. All Richmond Track Wheels are fitted with quality bearings and the double bearing design allows for an increased load capacity. The CNC machined, precision C groove ensures a smooth and consistent rolling action on the gate track and the gold zinc plating provides rust protection.