Will these hole saws work on stainless steel or just mild steel?

Bi-metal saws handle both. They'll cut stainless slower than mild steel, but they won't burn out. Use cutting fluid if you're doing stainless to keep the teeth cooler and extend life.

Do I need a drill press, or can I use a hand drill?

A hand drill works, but a drill press gives you better control and straighter holes, especially on thin gauge material. If you're drilling by hand, clamp your workpiece and keep steady pressure — let the saw do the work.

What sizes are in the set?

The set includes 9 common sizes. Contact us with your specific hole-drilling needs if you need to confirm exact diameters before ordering.