A preformed stainless steel crown may be provided for children and is a Band 2 treatment item.
As with any Band 2 claim, an examination and an assessment of the patient's oral health, and completion of the planned treatment (that the patient is willing to undergo) is a requirement.
A preformed stainless steel crown would not be considered appropriate as a definitive restoration for permanent teeth for adults.
A stainless steel crown should be indicated on the Clinical Data Set as 'preformed crown' and the treatment recorded in your clinical notes.