Used Halfords roof box. Good condition.
One key only so another would need to be cut.
U bar type fittings di.ensions 80mm x 35mm as shown in photo 5 for square roof bars but it has been used on other shape bars (wing/aero) within these dimensions.
50kg max load capacity. Guessing at approx 320L capacity based on measured dimensions and historic ads for Halfords boxes.