Wessex windows white powder coated aluminium sliding door double glazed unit. Cost us well over £1000 15 years ago and removed from its place in the house when we put in an extension. it has sat in the shed ever since. All insulation still with it and everything should be fully functional. It needs a clean but there were no scratches or anything when we put it into the shed. Measures 216cm wide by 201cm high. Bottom cill is 220 wide. Free to anyone who can collect it.