SALIStep Drill Bits Set 1/4"-3/4",9 Sizes HSS M35 Four Spiral Flute Nano Blue Coated Cobalt Step Drill Bits Hole Expander for Hole Drilling in Stainless Steel, Copper, Aluminum, Wood, Plastic

Works great

I knew i was going to need a step drill for tougher materials like stainless and hot rolled steel. I had a job that defeated my yellow Ti coated HSS step drill - so I ordered this M35 Cobalt version and it cut through effortlessly.Some of the steps are shallower than others so for thicker materials you might have to come from both sides, or drill the desired hole size halfway through and clean up with a file or die grinder. Check the thickness of the step at size of your desired hole against the thickness of the material.On the plus side, this allows the step drill to be a shorter length - which in turn allows you to drill a larger hole without cutting through the other side of the tube. So this is a solution that does have a significant advantage if there is something on the other side you don't want to put a hole in.

Better than the plain brass ones

Worked great for me and good value.

These look impressive. I have not used on metal yet. I normally use a 1/4 drill bit to start - once you whip the tip every use is frustrating.

Garbage, broke the first time I used it.

Looses edge VERY quickly. Was cutting two holes in soft wood. Bound up in middle of first hole.

I love how it looks. It holds the coating well. Cuts right through metal like butter!!! It doesn't overheat. They just need to correct the color label on the packaging. The multicolor is labeled black and the black is labeled multi ... lol. Great product. I plan on getting the other sizes now!