2.5mm Cobalt Drill Bits - 13 Pack of M35 Cobalt Drill Bits with Storage Case - Perfect Metric Drill Bits for Metal, Hardened & Stainless Steel, Cast Iron, and More!

Used the first drill bit for 20 pens no problem. Straight and sharp, still going strong.

They work good, with drilling/sawing lubricant it will work faster and do a better job, plus last longer.

Great drills y they come in a nice packet

I'm not sure how long these bits stay sharp, but with only a few uses, I found these bits to be more effective for drilling mild steel than hardened steel bits I've used over the years. Bits haven't broken or twisted into pretzels as other "made in China" drill bits for metals have.

The product is good, priced very well and is very difficult to find. Shipped and received within two days.Drills are used in model crafting and they work very well.

Not entirely happy with the product. I made sure I used proper lubrication, didn’t flex the bit, and didn’t just improperly use the tool. Glad I bought 3 bits to drill one hole, I snapped the first, then dulled it to the point of no return. Second and third bits just got rounded and after about 2 hours I got my one single hole drilled and can finish the restoration. But for $20 I would just buy cheap made concrete bits, does the same with a fraction of the price and bit as much aggravation

what can I say I ordered them they came and are what I ordered

I ordered 2.5mm drill bits and they say they're 2.5mm but they are clearly 3mm. I just drilled 24 holes in aluminum to tap to M3 and that's not going to happen. Not very happy.