50mm EPS Coolroom Insulated Panel Z Lock is suitable for building an Office, Caravan, Annex, Shipping Containers, Partition Wall , Spray Booth, Portable House, Truck Body, Food Trailers, etc . Z Lock Panels are Interlock and you won't need any extra piece in between to join the walls or roof together . Z Lock Panels come in standard width of 1170mm with 1150mm effective coverage.