plated bits, soft metal
921744
they look nice, but hold on a moment; take a closer look. These are all chrome-plated bits. Seems rather dumb when you're dealing with something that has grooves and angles at 1/64th of an inch or less. One turn and they start to flake off, the bit loses shape and you burr up the screw or bit.ok for the larger standard bits, but otherwise not great.
4147346
i bought these mostly for work on silver. i make rings out of coins and what not. alot of the previous dremel bits i used would either break, take forever, or bevel the edges over where i was trying to cut rather than simply remove the material

these bits though, they eat through it. reduced my dremmel time by about 70%. and the bits seem to hold up wonderfully, no chipping or serious wear that i noted. for this price go ahead and grab two lol
3086012
Very happy that these came as metal.  There are 2 of each gear with 20 different gears, making the 40 piece set.  There are 2 gears types that only have 1 hole to thread through, but everything else will be easy to work with.
186217
love the platinum plated option as I'm allergic to nearly every metal type.  Earing posts are soft and bend easily.  I would have loved a comfort back on the earings instead of the standard back.
512963
This drill bit made nice holes in 1/8" aluminum plate and steel sheet metal.  However, my hand drill was taxed nearly to its limit.  You'll want to use this in a BIG hand drill, or preferably a drill press.
2378684
This bit set has just about everything an electronics tinkerer could want. There are bits for opening even the smallest of fasteners on devices like the Iphone and most Android phones, as well as a full suite of bits for opening gaming consoles. The three sided phillips bit (used in opening all Nintendo products) is worth the price of admission alone. The case is well organized and visually appealing as well.
The down sides of this product are, first and foremost, the quality of the material used to cast the bits. Any decent amount of torques will tear these bits to shreds leaving you with one less usable bit, as well as, most likely, a stripped screw head. The bit holders feel a bit cheap to the touch as well.
All in all, good set for the price. Just be sure not to try and remove any rusted or stripped bits and it should accomplish just about any tasks you've been putting off due to dreaded specialty bits.
720209
These have worked very well for the aluminum parts I needed holes drilled into, ate through the metal like butter. I imagine it they would work very good in plastics or soft metals, don't know about harder metals like steel, but for my normal applications these work pretty well. The latch on the case was kind of flimsy, but that's fine, I wasn't really planning on using the case anyway. Overall very pleased with this purchase.
2718549
These are copper plated as stated. I got them to make my own retro style handles and trim for an entertainment stand I'm building. Looks/ works great for that.
2726905
Nice product that worked exactly as needed for a automotive project.  While I did not subject these to high torque to test the strength of the bits, I suspect they will work perfectly for all of my needs.
3709982
High quality bits, never experienced any chipping. I recommend this to anyone who needs a ratcheting screw driver.

Only negative thing is that the little bits are hard to take out of their little sets. but that's not too bad.
3597228
Replaced my old bit which lasted a pretty long time. Don't force the bit through the material and you'll get some impressively beautiful circles in your metal. Nothing else comes close to the quality of cuts the tool provides and these bits are invaluable.
1625945
These bits are of good quality. They have not stripped out under normal conditions, where others have. I would buy again.
2419106
I really like these switch plates. We are replacing all our plastic plates with these metal plates.
1447229
The 10 piece set comes in a soft, semi-rigid, case and the following sizes: 7/16", 1/2", 9/16", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4" and 1-3/8"
The 6 pack hard case of these bits are in my drill bag along with a similarly case 14 piece set of Bosch Daredevil and a 12 piece set of quick change spade bits in a roll up case. These are the most aggressive hole makers of the bunch with the Daredevils a close second. Unlike the Daredevils these cut at any angle. They leave a slightly less clean hole then the Daredevils and no where near as clean as the normal spade bits or a hole saw.
While these are aggressive they aren't strong or tough enough to stay sharp after a hit or even close pass to a nail. If the possibility of hitting a nail is there I switch to either my long Irwin ship augers or my short Bosch auger bits. Neither seems as fast cutting as these Speedbor bits but both augers chew through nails. If you only occasionally may hit a nail you can do what I do and keep a small round file with these bits to sharpen them up after a nail strike or just from time to time.
The only downside to these bits is the case. I have dozens of these bits now because I keep buying more sets as the cases fall apart; I wish they sold a replacement case. I've sucked it up and paid double the 6 piece kit to get the 10 piece not for the increased sizes but for the better case and the soft case leaves something to be desired; unlike the Daredevil case which includes elastic bands sewn in to keep the bits in place the Irwin just has 1 channel without divisions so when unzip it after getting bounced around the bits seam to always fall out. I still give the bits 5-stars because they work so well I just wish Irwin put as much thought into the case as they did the bits.
One additional note as these are 1/4" quick change shanks if you use an extension with them make sure the extension can cope with the torque put out by your drill; while these bits rarely bind they can and when they do they can hurt your wrist or when using an extension snap the end off or break it at the shank. I was using a Dewalt Impact rated extension when the bit bound and the Dewalt brush-less hammer-drill I was using, not in hammer mode, didn't care and snapped the 12" extension right at the end of its 1/4" hex portion before it transitioned to a round shaft. I would of expected more from something that is impact rated but at least Dewalt's return policy was great and replaced the extension without question.
200512
Best thing about these is the quality of the metal used. Under normal torque loads I have had no issues with any of the bits.
1410391
This is a good set of tamperproof bits.  I used it twice the day I received it.  The set has a large assortment of bits.  Some bits like the offset Phillips and the 3 wing bits will possibly never be used.  The magnetic handle helps start screws in awkward places.  The handle fits into the bottom of the bit holder so they should stay together.  The only drawback is Klein tools used to be made in the USA but these came from Taiwan or China.  I can't remember which as I threw out the packaging.  I try to buy American made tools and hoped these were.  For what they cost they should have been.
4303710
Tips are not magnetic, but the wide assortment of bits is nice.