MACXCOIP Cobalt Number Size Drill Bit Set, 60Pcs M35 High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Storage Case, #1-60

I cleared a stripped screw head using one of these bits and it took me less than 20 seconds. I had previously tried using several different extractors and none worked. One of these bits was literally the only way I could remove the screw. For note taking purposes, the screw belonged to a door knob and was also warped. I am happy with the quality of all of the drill bits. Mine came slightly lubricated with some kind of machine oil. The affordability of these cobalt drill bits is excellent and their performance is even better. The speed that I was able to remove the stripped screw with was amazing. I literally drilled into it and the lingering stuck knob literally fell off. If all else fails and you're trying to remove a stripped or warped screw, try using these bits to help you out.

Good quality bits, cut easily and accurately (photo). My usual test for cobalt bits is stainless steel, these bits cut through as easily as mild steel. Run them slow, and dip into water periodically to cool off if you have thick material. It’s also a good idea to use Tap Magic cutting fluid to reduce friction, and thus keep the bits cooler. Good price, happy with purchase.

The drill set is as shown . The metal housing is damaged from shipping. The tiny brass hinges are weak and broke and the inside bent. The drill bits themselves are fine.

I had a use case where a machine screw had broken off in a location that wasn't easy to access. I decided versus pulling the piece of equipment apart to improve access, I'd spend the money on a set of these with the hopes it would catch as I was drilling out the broken off screw. The screw broke during installation, so I wasn't worried about rust or anything like that, and the roll of the dice paid off. As I slowly increased the size of the bits, one finally caught and backed it out. I replaced the machine screw with a new one and job done. This set saved me about an hour of disassembly and for me, that made the set worth the price. I don't know long-term how they'll hold up, but for me, these will be used infrequently and as I mentioned, they've already paid for themselves, so future use is just money in the bank. The case is nice and the quality seems good, so no regrets here.

Extremely sharp and well made. Incredible value for the cost of these cobalt bits.

Good for wood but for metal work slow. Took me More time to drill in metal pipe. Size looks small as i expected.

I purchase this set just under a year ago. I have not use these drill bits but a couple of times and 4 have already broken. 10/6/2025 Update. Macxcoip Cobalt Drill Bits set seller reached out address any issues or concerns in my satisfaction with the product I received. They offer a full refund or to issue a new set of Drill bits. In a couple of days, I received the new drill bits in the mail, and I must say that these have changed my mind with the quality of Macxcoip Drill Bits. I guess the original set I received was a fluke in the quality, because the replacement bits issued area awesome and seem to be holding up great. Good company that stands behind their product and customer satisfaction.

Solid drill bits that cut really well