Red Hound Auto 6" Universal Jack Wheel Caster 360 Degree Turn Radius W/pin A-Frame Trailer Swivel Hitch Replacement Removable Boat Truck Red Hound Auto Premium Trailer Jack Wheel Caster wheel: 6 in wheel diameter; fits 2 inch jack opening Easily attaches with removable spring pin lock Strong polycarbonate wheel with 1,200 lbs capacity Metals are zinc plated for rust and weather protection