amoolo Cobalt Drill Bit Set (1/16"-1/4",13 Pcs), M35 HSS Metal Drill Bits for Steel, Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood

I purchased these bits so that I could put up blinds on a metal window frame. I have an old ceramic power drill that could drill through just about anything, but I realized that the problem was the bits that I had was not strong enough to penetrate metal. These bits did not dissapoint. They easily allowed the drill to drill through the metal quickly and easily. I am pleased with this purchase.

I tend to break the smaller bits and this package of quality drill bits helps me continue to put up window blinds around the house.

The Amoolo 1/4" Cobalt Drill Bits are sharp and cut through metal, wood, and plastic with ease. They don’t overheat quickly, and the precision is great. The value for a 10-pack is solid.However, I noticed they wear out faster than expected when drilling through harder metals. For light to medium-duty work, they’re excellent, but for heavy use, they might not last as long. Overall, a good buy for the price!

They worked great on iron metal.

Wow, wish I had done better research last year when I had to make holes bigger in order to put wheels on my patio furniture.This year I needed to make mounting holes bigger on shelf brackets. Brackets are made of cast iron. Used the old drill from last year & got nowhere really fast.Took a deeper dive into what kind of drill I would need for my application & colbalt was recommended. I bought these figuring if one breaks or I totally mess up (I am a newbie at all this) at least I have more.Well, no exaggeration, literally 15 seconds per hole & I was all set. These are really great drill bits.

I’m always amazed when something really works well. I drilled one hole each in five 1/8” stainless backing plates using just one of these bits. I oiled and kept oiling the work area with Magic Mystery Oil and the bit cut lit it was nothing, nothing I tell you. If anything the bit worked better the more I used it. Very satisfied.

Good quality and selection

I have drilled 3 holes with a 7/64 bit into 1/8"mild steel angle iron, had to switch to another 7/64 bit to finish the third hole and drill the rest. Its only the first bit out of this set but its not looking too good.Your milage may vary.update: still not sure what was going on with the 7/64th bit but later I broke the tip off another bit so the hardness is really there. I resharpened it and all was well. So thinking about the 7/64 bit I sharpened it and to my surprise I had no further issues with it. Im now wondering if the bit was not quite sharpened correctly when made (possibly a friday afternoon). So these seem to be a pretty good value.