4991 Ancillary items (0) 4997 Cleaning, repairing and renovating existing items of miscellaneous metals (0) Cleaning, repairing, renovating and refurbishing existing items of other metals 4998 Alteration work; demolishing and reconstructing items of miscellaneous metals (0) Demolishing and reconstructing items of other metals as a part of general demolition, reconstruction, alterations and additions