4-32mm Metric 5% Cobalt Step Drill Bit for Stainless Steel and Hard Metal (15 Steps)

All metal bits are consumable in my opinion. But this one is lasting a really long time. Very sharp, and with proper tap oil cuts very clean holes in aluminum and steel. Price is great, so I’ll buy another in anticipation of eventual failure, and will probably continue to buy more.

This bit is awesome. Needed to drill quarter inch steel on my heavy duty utility trailer. I used a center punch to mark my holes. Plenty of cutting oil and a slow speed on the drill, easily punched right through. Clean holes.

If drilling thru stainless use cutting oil and this will last. This drill did the job.

I bought 2 of these expecting both be trash at the end of my project. I had 56 holes to drill into 2 stainless steel cabinets. Hole sizes 14mm 16mm and 22mm. The bit started out cutting through 0.75in thk. 304 Stainless like butter. Figured I would get about 10 holes done before it started to wear. Much to my amazement I was able to complete the job. The last 8 were difficult but only at the 14mm step. All of the other steps were still cutting well. After all said and done only needed 1 bit. 1 thing to be noted. I did not take it easy on the bit. I horsed this through the metal. It got very hot but just kept going. If you ate thinking of buying one. Think no further. Just remember to use a little cutting oil and you will be very happy with the results.

I've been using this bit for almost 5 years! We have a small van upfitting business and use this thing a few times per week, on cargo area support ribs for rivnut placement. This thing is STILL sharp and cuts great. Amazing given the heavy reinforced steel construction of the support ribs.

I needed this bit to set the pilot hole to open up some axle flanges to fit GM metric studs(12mm). I used the 12mm step to pilot the hole then used another regular cobalt bit to drill through. Axle flange was made of hardened steel about 3/8 thick. The bit made quick work of the 10 holes I did. I lubed the hole with cutting oil.

I am a Journeyman sheet metal worker (retired). I had my tools stolen and I needed a uni-bit for stainless. Good thing: it starts itself. That first penetration takes a bit of time ( keep the oil up!) but once it does it really rips. Be careful that once the hole is started slow the speed and lighten up on the pressure, Otherwise this will bite hard and possibly warp your work (and hurt your wrist) depending on thickness. I was drilling a 18 ga. backsplash. I got a few minor distortions because this bit bit hard. The trim piece for my faucet covered them. I have had other cobalt bits before but this is the best.

Needed to drill through 3mm Stainless Steel and have varying hole sizes for the task. This bit provided 20 holes at varying diameters. It cut through the first 10 holes with little degradation. The last hole drilled was degraded by approximately 20% from the first, which is better than I had anticipated. What makes this bit great is that it works and provides different diameter drilling with just one bit.

excellent for stainless plate. good drill bit. would buy again if needed.

Wow, this step bit cuts through stainless steel sheet with barely any effort. I drilled 2 holed in my SS BBQ lid, which is heavy guage SS, and this baby cut through with no problems. I did start with a tiny pilot hole.

Gute Verpackung, Schnelle Lieferung, Sehr gute Qualität, Kaufen gerne wieder,

How often do you spend £30 on a drill bit? If it cuts like this one does then I'd ensure a quality spend any day as it's value for money. Used to cut through 6mm steel bulkhead on a narrow boat for an isolator switch install in a difficult position. Absolutely brilliant bit of kit, large pilot hole first then cutting oil and a steady drill speed made a 26mm hole with ease. Apart from a few scratch marks the cutter still looks brand new, I hope to use it for many more hole drillings in the future. I've used the cheaper version with their goldish coating before and can honestly say they are rubbish compared to this.

Just used it once and it seems fine