The Leighton Denny crystal file is the Rolls Royce of the nail file world. I am something if a nail officianado (sp?) Then I would go for an Emery board, and metal only if it was a dire emergency.
Is it weird to admit I’ve never used a nail file of any description? I just cut them with a pair of fine nail scissors. Nail files in my mind equate to blackboard dragging. I don’t even like watching somebody do their own ?