The original ‘Abrafiles’ were very thin steel files, and fitted a hacksaw via clips so if you needed cut a profile entirely within the material the pilot-hole for their end beads was of minimal diameter – about 1/8″ I think.
They have disappeared, but the abrasive wire-saw blades sold in hardware-shops and builders’ merchants for cutting tiles and the like will cut mild-steel. I have not tried them on other metals – aluminium would probably clog them.
As these are for cutting glazed ceramics they might work on High-Speed Steel, for roughing a blank to shape. I’ve not tried it though.
They are even more fragile than the Abrafiles were, and their crimped-eyelet ends require a sizeable pilot hole.