Klein ToolsQRSTSPRO Premium 3-Piece Electrician's Step Bit Set with Cutting Oil, Modular Case, Impact Rated Quick Release, Double Spiral Flutes

works great, fits any size

Klein always makes great tools this is a durable and sharp bit that is at a good price compared to Milwaukee

The is by far the best drill bit I have ever used. I needed to drill a hole in a stainless steel sink. I was installing a filtered water faucet. I had heard there were hardening issues when drilling stainless steel so I was nervous doing it. I watched a few you tube videos and most showed using a step drill bit. After reading the reviews on the Klein Tools KTSB14 Step Drill Bit I decided to purchase one. To keep the stainless steel cool, I placed ice cubes around the spot where I was going to drill the hole. I dipped the Klein Tools KTSB14 Step Drill Bit in a small bowl of water with ice cubes to keep it cool. Drilling at a very SLOW speed and applying a lot of pressure I started to drill the hole. At first it only made a dimple. I again dipped the bit into the iced water and then started drilling again but at a LITTLE faster speed. Once the bit started cutting there was no stopping. It cut like a hot knife in butter. I dipped the bit into the iced water for a third time and started drilling some more. In seconds I was done. The hole was perfectly cut thanks to the markings on the side of the bit and the bit was cold to the touch thanks to the iced water and slow speed I drilled at. It took longer to write this review than it did drilling the hole.

Excelente Calidad! Recomendable.

Ate through sheet metal wall of storage building in step-wise cuts. Very sharp. Don't over cut the size you want. It would be easy to do that. The only product for a neat cut through metal walls with. 1 and 1/2" cut.

I used this drill bit today to open up existing holes in the sheet metal frame of my vehicle for a trailer hitch install. The description says 3/8" hex shank but mine was 5/16" hex. I needed to snake it up through the exhaust system. So, I just put a 1/4" drive tool on my cordless drill with a short extension and then a 5/16" six point, 1/4" drive socket. The bit cut through the (likely) hardened sheet metal like butter. Chips fly everywhere so you need to wear goggles or a mask. Glasses won't cut it. The faster you spin it, the smoother it runs. At the end, I ran it in reverse to clean up the edge. Wiped the bare edge with some gun bluing for protection.One improvement would be to label the hole diameters for the steps. I assume Klein figures electrician customers just need those hole sizes indicated. I stopped short of the 1-1/8" as the hole was big enough to pass the carriage bolt through. All-in-all, great purchase. I preferred the name brand over Chinese label.

I bought a drain pan from Killarney Metals that was stainless steel to replace a damaged plastic drain pan and poor workmanship of the existing drain pipe.I used Klein annular cutters with Tap Magic cutting fluid to cut the initial hole. Then I used the Klein step drill bit to expand the hole to the right size for the PVC fitting.With stainless steel, it’s important not to heat the metal for it gets really hard to cut. Once I saw smoke, I would back off and use more cutting fluid. I use step drill bits to expand metal holes rather than do the entire hole to save on wear.The nice thing about the Klein is that the steps are small enough to get a nice fit. They are also some what expensive, so if it’s a one time job, you may be better served with a cheaper brand.

Great unibit. Don't let people borrow it and learn to use it properly and it'll last.

Excelente compra, cumple todo

Ótimo custo e benefício, indico!

This step drill is the best tool I have found to very quickly yet reliably create the 3 standard hole sizes required to connect small diameter conduit to a steel electrical equipment box. It cuts a hole through steel plate much faster than a hole saw, and creates a perfect hole leaving no burrs. This step drill is evidently of high quality consistent with its cost, and I expect it will continue to perform well for many more jobs than similar less expensive products being sold.

Cannot beat the quality of Klein tools

Se perforó PTR cal. 12 sin ningún problema