Hymnorq Metric M10 x 1.5 Drill and Tap Combination Bit, Black TiAIN Finish M35 HSS-Co, 1/4 Hex Shank and Self-Centering 118 Degree Split Point, for Tapping Aluminum Iron and Stainless Steel

I am very happy with this tap set so far. I specifically bought this set in order to get the 2 smallest sizes in the set. Do at your own risk. I saw a video online where a machinist took a small tap and threaded the spring hole on a lower receiver, cut down his rear takedown pin spring to compensate for the allen type set screw length, and he successfully eliminated the need to "smash" the rear takedown pin spring against the stock or sling plate. I have done 2 myself, and I can tell you it has worked great. I put this combination 1/8" - 40 NS drill/tap into a hand "dogbone" ratchet and took my time, making sure to back out the shavings every few 16ths. It came out beautifully. Now I only need to remove the set screw in the event I want to dismantle the rear takedown for some reason, and now I can switch stocks at my leisure without having to worry about losing the spring or smashing/kinking the spring. I also really like not having to hunt for the proper drill size in order to tap. In addition, I also really like having the quick-change ends so these can be used in a hand ratchet, a mini impact, or a cordless drill.

I used this combo bit to drill and tap a hole in the dropout of an aluminum mountain bike for a disc brake conversion bracket. Once I made the mark of where the center of the hole would be, I center punched it and started off with some cutting oil and a small drill bit for a pilot hole. I then switched to a slightly larger size drill bit to further widen the hole. Finally, using the combo bit in a cordless clutch power drill and some cutting oil, I slowly drilled and tapped the hole. To prevent damage to the threads when reversing out, I un-chucked the bit from the drill and reversed it by hand using a T-handle socket drive. Took some time, but it worked great and it didn't snap. All in all, great product.

First, being only a garage wood hobbyist, my experience depth is shallow. I was looking for a creative way to attach metal legs to a live edge table I had just finished. While think I just didn't think using a screw was going to give me the holding power I would need. I found these online and tried a few scrap pieces first. My method was to drill a small hole first, then using the tap and only go in. I removed the drill and used a small wrench to slowly back out the tap. I was concerned I might strip the hole reversing the drill. Since this time, I have done several other jobs and will probably look to this, instead of thru bolts or screws.

I had both the M5 and M3 taps break in aluminum when attempting to tap by hand. They worked fine for plastic, but I'm going to stick to better brands for work in aluminum. I've used both conventional and spiral flute taps before from Dormer, Morse, etc in aluminum and haven't broken any of those taps, so I at least sort of know what I'm doing.

This set of taps worked great. I liked that they drilled the hole, and tapped it at the same time. All of the tapping was done on aluminium, and they made perfect threads every time. Take your time when using the bits. Use plenty of oil, and take it slow. I had no problems with the set so far. Not a single one has broken yet. I really like them alot.

These bits are life-changing. I'd just been using normal drill bits and taps. This saves time and makes threaded holes of the same quality. Oh, and they're hex-shank, so you can use them in an electric screwdriver.One thing you should realize, though: If you're going to use these for drilling holes that don't necessarily need threads, you're going to annoy yourself pretty quick. You have to reverse the drill and back out of every hole.

So far I have used 2 bits and the m6 worked great but the m2 flew into 4 parts and I was lucky enough that it was backing out when it came apart and I was able to salvage the piece I was trying to tap. It was my fault for not using enough cutting oil as I drilled. They are not bad for what they cost and buying another set to finish is still worth the time and money considering the cost of tap sets and numbered drill sets. I will buy this again.

With a press drill these I can see being perfect.In a hand drill they can be tricky to use on hard AND soft material.On hard it hard to get it to bit so you will want to use a smaller drill to drill a pilot hole.On soft if you slip a little you can screw up the alignment and then the tap part won't be so useful.Trick is to go slow and have a good pilot hole no matter what.