Anyone know what kind of steel is used for Allen wrenches or other hex keys or hex shafted screw drivers? I've just come into a bunch of hex key and screwdriver shaft drops and rejects. Should be good for tooling, punches, etc.... I'm thinking that they're O-1 or other similar oil quenching steel. Dave Brown Heritage Smithing Green Bay, WI ABANA, UMBA, GoM, MODA, ARG