Yakamoz 20Pcs 0.3-1.6mm Shank Mini Micro Drill Bit Set Twist Drill DIY Kit Rotary Hand Tools

I needed small drill bits and these work. I am using them to drill the optical fiber lines used for the lights on the Star Trek shuttle.

Quality and size is very good

Used once. worked fine. Drill bits were not in proper order but check before use. I like the flat storage box and the ability to select and dispense the bit for use.

I bought these to clean out and slightly enlarge a gas stove orifice and they worked great. The index box is cheap plastic but for this price, so what?For my propane stove the jets are around 0.85mm and the bits in that range worked great. Finally can get the wok hot enough! Of course, modifying a gas stove is completely dangerous and YOU should never even consider it. A narrow pin-vice is also required for such a task and there are even some for sale WITH drill bits, but I already had a pin vice, so just bits is all I needed.

Update! Replacement bit set arrived very quickly, so kudos to Amazon for that. However, the replacement set is again nearly useless, just in different ways.New failures as compared to failures in original set:• replacement set appears to have received no heat treatment at all, bits are light grey and soft, as opposed to the original set I received which had dark, blue bits (too dark, too blue) with burnt flute edges. Hard to say which is worse.• points on bits are nearly flat, but at least these have something somewhat similar to a point, unlike the first set I received.• cutting edges are dull as wax, unable to cut plastic or solder. Original set had some pretty f'd up points, but at least they *sorta* were able to cut• new set has the shallowest flutes I have ever seen, they're like shadows, barely there. And, again, soft edges as if run through a vibratory tumbler overnight before shipping.Once again, these are bad bits and not worth your time nor your money. Take a walk over to Harbor Freight instead - you'll get some steps in (gotta keep moving!) and you'll be able to actually inspect their garbage before you buy it, instead of rolling the dice with Amazon.hth,Dr. Martha Bezos-Faulkner, PhD (Phat Doctor)Original Review: As delivered, bits were all out of order and will require checking each with a caliper to determine which is which and put them back in order. This is complicated by the fact that several bits are duplicates, so some sizes there’s two, some sizes there’s none at all. When I have some time to burn I will sit down with this set and a nice calibrated Starrett caliper, take some measurements and pics, and I’ll be sure to update this review with more pics and data.What makes this set of drill bits barely better than scrap is that many of them are showing blueing from heat damage (from the manufacturing process, most likely, I mean, surely they haven’t been used, right?), and many have unfinished threads and tips - one of them just spirals off like a tailing fallen from a lathe! All are without edge and useless for any attempt at drilling. My pics show some of the most notable offenders.Even though I have requested a replacement from Amazon and I am hoping for a miracle, I can not in good faith recommend this product. You will be far better served by going to Grainger or McMaster-Carr and also maybe learning something in the selection/ordering process.

It works extremely well on metal miniatures. However, if you're the sort that needs a variety of different sized bits, this isn't for you. Several of the promised sizes are not correct, when measuring with a pair of digital calipers. And many are copies. Fortunately for me, that's perfectly fine as the sizes I need for pinning happen to have copies that works well enough.

I own a small engine repair shop and these work great for drilling out jets in carburetors.

They are good, good range of calibers and quite precise.They are also very fragile, and one of the bits didn't had a good bite. Used to drill a resin miniature and had trouble drilling, added a little more pressure and it broke. Used another bit (the next larger) and it cut perfectly.