Customer Reviews

Bosch CO18 18-Piece Cobalt Twist Drill Bit Assortment in Plastic Case

5 star:		(8)
4 star:		(4)
3 star:		(1)
2 star:		(0)
1 star:		(0)

 

 

These bits are fantastic. I used one 3/8 inch bit to cut 24 holes in 3/16 steel almost like it was wood -- very fast. No sign of dulling. Excellent bits, but one small one was missing.

these are very high quality bits, they are sharp and they stay sharp. I notice they have a very steep angle to them which means that they attack the material rather rapidly.

I needed to drill a 1/4 inch hole in heavy, thick 10 gauge steel. On a medium speed using a hand drill these bits made short work of it. Very sharp, very clean hole. I was quite impressed - the right tool for the job.

IF YOU NEED SOME DECENT DRILL BITS, HERE THEY ARE. THEY HAVE A NICE SHARP POINT ON THEM AND THEY DRILL THROUGH STEEL LIKE BUTTER. BUY THEM, THEY WORK.

I purchased these bits as cobalt is better/stronger than titanium, and therefore should last longer. One bit was missing from the set. I called Bosch and they immediately send me a replacement.

I had a fine set of DeWalt drill bits that see light duty at home. They were adequate for wood and mediocre for plastic (with a tendency to grab and bind). However, I was recently working on an electronics project housed in a steel box with aluminum front and back panels. The DeWalt bits worked ok on the aluminum panels but would scarely scratch the paint on the steel shell. My usual practice is to drill a pilot hole with the smallest drill bit that won't likely break in the process. But, wow, I couldn't get even the smallest drill bit I dared use do more than make a modest dent in the steel shell. I purchased the Bosch drill index specifically for this project. The cobalt-alloy did the trick. I punched the holes through with nominal effort and was delighted that the drill didn't bind after penetrating the metal. These drill bits are fantastic!

I was VERY impressed.

Five stars and two thumbs up!!!!

I first because very impressed with cobalt bits after drilling a ton of holes in 1/4 red iron with dewalt bits and the bosch just don't last nearly as long. without a pilot hole the bits above 3/16" wear out much faster than the dewalts. It's the nicest case for drill bits i've ever had though so it gets' three stars, when one brakes or wears out, i just replace it with a dewalt...

Nice set, very sharp. Cobalt is the way to go if you let the bit do the work. I was tired of worn out cheap bits and even bought a drill sharpener. They just would not sharpen or last. So far these bits have been great.I plan on throwing out all of my old bits.

The bits themselves are excellent quality, and I think that this bit set is one of Bosch's best products. However, the case could use some work. The latch popped off the first time I shut the case, but I was able to pop it back on. The holders for the bits are also made of cheap plastic, and probably won't last nearly as long as the bits will.

Overall a good product, and well worth the money.

the bits are great and go through anything, though i wish the case would fit into the drill's carrying case. in any event the bits are excellent.