BOSCH CO14B 14ピース アソートセット ケース付き - コバルトM42メタルドリルビット 3フラットシャンク付き ステンレススチール、鋳鉄、チタン、ライトゲージメタルの穴あけ用途用

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

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.

Las mejores brocas, que puedes encontrar en el mercado para perforar, el hierro forjado y el acero inoxidable

Alles Gut

Excellent much better than the basic ones