🔍 SpeTool’s focus is mostly on wood, plastic, and non-ferrous metal cutting. They do have some **3-flute and 4-flute end mills** that are advertised for aluminum and brass (non-ferrous) and even some that mention stainless steel:contentReference[oaicite:81]{index=81}. These are solid carbide end mills with appropriate geometry and often special coatings (like TiAlN or similar) for harder metals. However, cutting steel on a CNC router (which typically has higher RPM and less rigidity than a milling machine) is tricky. If you have a very rigid CNC and can run low RPM, you might use their 2-flute or 3-flute carbide end mills to *lightly* mill mild steel or stainless. But for most hobby CNC routers, steel is not really feasible beyond engraving or very shallow cuts – it’s more of a job for a metal milling machine. So while SpeTool offers cutters that in theory can cut steel (because carbide can handle it), using them in a router setup requires extreme care (slow feed, very shallow depth, maybe coolant). For practical purposes, consider their “metal cutting” bits as primarily for aluminum and brass. If you need to machine steel often, you’d likely look at specialty slow-RPM tools or a different class of machine. So short answer: they have bits that can handle steel, but cutting steel on a router is advanced territory – not typically recommended unless you know what you’re doing.

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