99 Pieces Twist Drill Bit Set Titanium HSS 4241, 135° Tip High Speed Steel, Size from 1/16" up to 3/8", Ideal Drilling in Wood/Cast Iron/Aluminum Alloy/Plastic/Fiberglass,

Purchased the set for my husband. Over time, we have lost and broken bits and, with several moves, our tools are not as organized as they once were. This metal case organizes a large number of bits that come in a wide range of sizes. Cannot imagine not having what we need with this selection. My husband was pleased with this gift and says that they work well with metal. Have not yet had the need to try on plastic. They did better with harder wood than soft but he says that the bits are intended to be used on metal anyway. Realistically, the smaller bits will break easier than the larger ones so it is good that there are so many of them in the case. If you are not familiar with the metric system, you may need to look it up. This is a very good product and I recommend it for all but those needing a heavy duty commercial set for daily use or someone working exclusively in wood. For home use or or basic contract use, this should be a very good choice.

I tried this kit this afternoon and destroyed five bits making three holes. On bit was crooked and of course it rotated so much at the tip that it could not "find" the center punched dimple.I tried to drill two 3mm holes in 16 ga steel. It took three bits. All burned up, getting red hot before completing the hole.I then needed to drill three 5mm holes in the steel. I got through one hole and the second one welded itself to the steel I was trying to drill. I couldn't finish the second hole as the welded bit part could not be punched out. I then tried the third hole and it went almost the way through then the bit melted again.This is a case where the packaging looks good, but the product is junk. It might work on wood or plastic, but it will not work on metal.

I'm a semi-retired DIY'er that's always doing projects around the house. My old set of drills are just high speed steel and they dull quickly. They are also just thrown together in a box. They are really a pain to sort through when looking for the drill I need. I love the way these are perfectly organized into a case that even shows you the drill size held in each compartment (see photo). The case is heavy duty and made of metal (see photo). It should hold up well and last a long time. I am also looking forward to using the titanium coated bits over and over again. I've only used them for about a week now, but so far they have held up very well. I would highly recommend.

There really are a lot of bits in here! The set arrived as described, in a heavy duty metal case. I didn't realize how many until bits this actually was until I visually saw them all. It's a good set. The titanium high speed steel works well. I expected some bits to break easily, since they give you multiples of each size and I was drilling steel, but they held up well. I do wish the case had holders in each indent to clip the bits in place, because they easily scramble around when you lock up and carry the case. The bits are all engraved though, so you can reorder them when they come out of their pockets.

A great price for some high quality drills. They feel very sharp. I've used on PT wood and aluminum pipe and the drills started the hole easy and went right through without heavy pressure. There are 2 or 3 of each larger size and increasingly more of each drill size as they get smaller. This is nice because it is pretty easy to break the smaller drill sizes, so this way you don't have to fret when you do so--just grab another. All the drills come in a sturdy metal case with a nice clasp that won't come unlatched and spill the drills. A foam layer on the top lid keeps the drills in their respective compartments; plus the little ones are in little plastic bags. Nice product.

The smaller sized bits are not true- the tip wobbles significantly as it rotates. They cut fine but if you need precise holes, the smaller bits are not up to the task. I haven't used the larger bits yet but am disappointed in the quality of the smaller bits (<1/8") so far.

I needed this product because I usually buy sets of drill bits with only 1 of each size.Well, inevitably, when one breaks, I'm just out of luck for that size in the future.This set is PERFECT because, not only do I get multiples of each size, I have several of the smaller sizes (which are always the ones that break).Plus, they come in a metal case to keep them organized, instead of that stupid plastic packaging you get at the store, and then you have drill bits rolling around in your tool kit all the time.Very happy with my purchase, and looking forward to not buying drill bits for a LONG time.

These bits are absolute garbage. I was drilling an M2 hole through an existing 1.6mm hole in 2mm thick aluminum, and snapped 4 bits. This was on a drill press to ensure no procession of the drill bit, as to prevent breaking. The aluminum plate was chocked up on an XY table. This should be a non-issue; however the bits snapped upon initial contact with the plate. I could only imagine the performance when using with a harder/denser metal like steel or brass.Although this drill bit set contains 99 pcs, you had better believe you will be going through these fast. Better off getting a mix of bits from McMaster Carr or similar. A comparable set with a mix of 1 or 2 of each bit has a comparable cost to this particular set. I have added one star to my single star review only due to the sheer number of bits included.