Hymnorq 19-Piece M35 Cobalt Steel Drill Bit Set in Tough Indexed Case, Metric Sizes 1mm to 10mm, Dual Twist Flute, 135° Split Point, Chamfered Straight Shank, Ideal for Drilling Metals

Here in the USA, Metric drill bits are extremely scarce as most of the country insists upon using an outdated Imperial system of drill bit sizes varying from fractions of an inch (21/64" anybody?) to an inverse numbering system (with a #2 being bigger than a #6)Refreshingly, the entirely decimal Metric system comes to the rescue! This Metric drill bit set is sized from 1.0mm to 10.0mm in 0.5mm increments. a most useful selection. The bits themselves are sharp and drill clean holes but the metal case, or drill index is not especially great.For sharpness, in a recent project I drilled 16 x 5mm holes and 10 x 3mm holes through 6mm thick aluminum. The last holes drilled as quickly and cleanly as the first, so they are at least decently sharp and durable.By the way, for those that absolutely can not get their head around millimeters, the smallest 1.0mm drill bit is this set is close to 3/64" and the largest 10mm drill is close to 25/64", or a bit bigger than 3/8"

At the time I purchased these, I only intended to use them for light duty (drilling into polymer). However, as fate would have it, I had to use them to drill into hardened steel, and much to my surprise, they performed admirably. It was a pleasant surprise (I was expecting "Chinese junk") and I'm very happy with this purchase; especially considering that it's a METRIC set, which is difficult to find (in the USA). I wish the set had a 1mm bit, but oh well. It's just a preference, not anything against the quality of the bits in this set.=============Update 1/16/18=============My rating has changed from 5 stars down to 3. I needed to drill into metal again--actually I wasn't even drilling new holes, but just "chasing" already existing holes to expand them--and neither the 4.5mm or 4.8mm bits would do anything. They just spun around getting hot, without cutting anything. I even tried the 5mm bit, even though that was too big for my purposes, and it also did nothing but spin. Thus, I've used four of the bits (4, 4.5, 4.8, and 5mm), and only one of them did anything. The one that actually worked did its job well; the others are a HUGE disappointment.=============Update 1/25/18=============Kudos to Migiwata customer service (thank you, Bella!). After hearing about my not-so-pleasant experience with these bits, they sent me a second set. Apparently their original supplier had run dry, and they had to use a second, temporary supplier while the original caught up with demand. The first set that I received was from the temporary supplier. The new set is from the original supplier, and the bits seem to be in order in this new set. So how do you tell the difference? By the case (see photos). The set with the blue dot on the case--which is a plastic retainer to keep the case closed--is from the original supplier. Now if you happen to get a set without the blue dot, don't panic. Just because I got a subpar set that slipped through the manufacturer's quality control process doesn't mean that you did, too. Try the bits out first. WORST case is that Migiwata customer service takes care of you like they did me; best case is you don't even have a problem. As for me and my review of this product, I'm a happy camper again and am bumping my rating back up to 5 stars. The bits are great (make sure to use a good cutting lubricant/coolant) and Migiwata customer service is stellar.

I bought 2 of these and they hold up well which is hard to find for medal bits :)

I bought this for maker projects. The pin vise is very good quality and works well. I understand the issue that some reviewers have complained about the jaws not holding straight, however, I was able to get the drill bits to hold straight and securely with minimal run out. The internal angle of the jaws is probably too large and the jaws are plated, which makes it more difficult to set the bit properly. However, it wasn't actually very difficult for an experienced machinist or toolmaker. I would not have noticed the issue if I hadn't read the other reviews. One nice feature is that there is a space inside the handle that will hold all but the largest size drill bit. As long as the jaws are closed they will not fall out. The drill bits themselves were not so good. Hence the 4 stars instead of five. They are not soft as other reviewers have reported, however, about half of them are not sharpened correctly and will not drill. If you inspect them under magnification, it is easy to see which ones are good. It really isn't practical to try resharpening this size of bit. However, you can get quality drill bits easily, so I didn't take off much. For me, getting a quality pin vise is way more important than the bits.

I figured these were just Chinesium steel when I ordered them, but they appear to be High Speed Steel, which is pretty amazing at this price. I'm not sure if they're cobalt HSS M35, but they're at least M2. I've made probably a hundred holes hand-drilling mild steel auto bodies with no dulling or chipping. I even drilled out a 304 stainless screw in my press with these and a bit of patience. If you're looking for something to drill fastener holes for angle iron, I'd say these are the ticket.The only thing I would complain about is the titanium nitride coating (added for reducing heat and friction) extends down the entire shank of the bit, which makes the shank prone to spinning in the chuck as it scrapes off the coating into burrs. Still giving 5 stars though because of the price.

I needed to drill through a steel weld and burned up a bunch of bits just trying get a pilot hole. I chucked up the 6.5mm bit from this set and squirted some 3 in 1 oil on it and she blasted right through it. I could care less about the case, THAT'S IMPRESSIVE!!!!

Decent bits. They seem like good quality, but for some inexplicable reason the manufacturer put them in a really brittle and flimsy case. While the bits may last, they will wind up scattered in a drawer.

Bits work as expected to drill holes for 1/4"x20 nutserts.