High-speed steel (HSS) provides good wear resistance and can be used in general-purpose applications on both ferrous and nonferrous materials.
The most economical set contains:
EO handle + S10 Blade, Green Sleeve (for Aluminum).
EO handle + S20 Blade, Red Sleeve (for Brass & Cast Iron).
EO handle + S100 Blade, Blue Sleeve (for Steel).
EO handle + S150 Blade, Yellow Sleeve (for Plastic).