BOSCH CO14B 14-Piece Assorted Set with Included Case Cobalt M42 Metal Drill Bit with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, Light-Gauge Metal, Aluminum

Excellent much better than the basic ones

top class

Normally use cheap drill bits but all the ones I had really struggled when drilling out a bolt. These ones made my life so much easier and saved me a lot of time. Always use a bit of cutting oil/spray when drilling metal and these are still sharp after use and hardly a scratch on them.

At the time of buying it wasn't obvious they were standard size not metric. They still seem like quality bits and drill steel like butter.

Quality sharp metal steel drill bits for the workshop. Bosch= Good Quality.

OK

Lot of money to not even touch it’s intended target doesn’t drill hard bolts

This is a comprehensive range of sizes in a sturdy case - with the added benefits of being Bosch-built, of Cobalt steel, so they should stay sharper, longer. When drilling steel or harder materials, it is always worth getting the drilling speed right for the work - and using copious quantities of drilling lubricant (if necessary), to cool the drilling area. Thus especially applies when you have invested in a set like this.

El funcionamiento de esta broca es muy bueno, se pueden hacer fácilmente perforaciones al metal

Great drill bits.

I never knew the magic of cobalt drill bits until I needed to drill some mounting holes on a steel bench grinder stand. The top of the stand was 3/8 in steel plate and it probably took 20 minutes to get through it with a standard bit. I did some research and ordered these bits. I don't need 50 different sizes because I'm not drilling metal frequently. This Bosch set seemed to be one of the few affordable sets that included the 1/2-in size. Plus... All of the bits above 3/16 I have a three-sided flat grind for better chuck lock up. Used the 1/4 in bit for a pilot and then the half inch bit to drill the remaining three holes. Less than 1 minute per hole, including the pilot, using a bit of cutting oil. It really is like magic. I'll be testing these to drill out a broken bolt in my mower deck next. I will update this review if I experience any durability issues. UPDATE: That broken spindle bolt in my mower deck must be special. Using low speed, a lot of pressure, and cutting oil I made it about a quarter inch into the bolt before dulling the bit. Switched to another bit and made it a bit further before killing that one too. Even with a decent hole drilled in the bolt, my extractors won't grab the hard metal. I'm not going to deduct a star since I didn't expect these bits to be invincible but hope this helps someone determine if these will work for your use case.

Quality material.

Buen producto especial para taladrar acero inoxidable