Square headed (not alen key shaped) size is measured across flats. Used for Lathe Chucks, 3 or 4 or 6 jaw chucks. Suitable for all makes. Hardened and Tempered.
Used For Universal Application, Scrolls Are Forged, Balanced And Hardened. All Supplied With Two Sets Of Solid Jaws Internal And External Stepped. In four jaws also available.