Hymnorq 5-Piece High-Speed Steel Combination Tap and Drill Bit Set, M8 x 1.25mm, Fully Ground, 118° Split Point, Dual Twist Flute

Sharp and durable, but the drill dimension is a little large so you lose a bit of the thread. You'll notice your threads have a flat "top" edge, because the drill takes too much material away before the threads are tapped. Still works good, but something to keep in mind.

Although not in the description, I used these for steel and it worked. My first attempt was with a drill and that was a mistake, the tap broke after making eye contact with the steel. If you plan on tapping steel, predrill and do it by hand. Works great with plastic as is and I didn't try aluminum but it seems like it would work. Definitely would buy again

I use these in a powered drill. I use these in precut holes in acrylic that has been processed on the laser. I make the holes a tad bit smaller than the tap thread. A quick spin in the drill and the threads are tapped. The previous set I bought hits the tapped area quicker.

I'm glad there's 5 of these to a pack, cause I'm down to 2 left. It seems like this type of tool snaps easily when applying more than about 20 lb-ft of torque.Using these in my ryobi one+ drills, I have snapped 3 from this set, plus two from other sources. I'm tapping pre-drilled M5.5 holes into 2020 Aluminum Extrusion, not terribly hard metal by any stretch. If you have the option, mount these in a drill press at low speed. The design makes drilling prone to wobbling around the drilling axis, and makes breaking bits much easier. Cutting oil helps, but doesn't prevent breaks. It's the right price though, and they do the job. I would buy again.

Using to add threads to 3D printed parts. Run slow and they will drill and cut threads nicely in PLA. If you run at high speeds PLA melts and ruins your threads.

I needed to thread some holes in a few 3D prints to use M5 nylon screws and these taps worked perfectly.I created my items using PETG and designed the holes just slightly smaller than the screws.Used the combo drill/tap to enlarge the holes and thread them at the same timeI ran the bit through the hole twice, cleaned it out and the M5 screw went in smoothly and works as I expected.For the price and my need to use them in hard plastics, they were perfect

I needed to expand the screw hole on the end of an aluminum servo horn from M2 to M3. I threw together some scrap so I could clamp it in place(see photo). I placed a drop of 3in1 oil on the hole and then drilled very slowly while keeping steady and applying a decent amount of pressure. I didn't have a T-handle so I just used a power drill and it worked perfectly.

These snap pretty easily and should really only be used for very thin sheet metal, maybe only mild steel studs and plastic. 20ga stainless sheet snapped one just like that.

The combination drill, and tap is working well to use on 4mm hard plastic. Use very slowly and WD40. The groves are large so plastic moves the small particles out of the way. Thank you. It is using very good.

Used one of the bits and drilled 5 holes before it snapped off. Wouldn't buy these again.

The first set I bought, the M6 snapped in the first hole, aluminum pre drilled hole. I assumed just a bad day on the assembly line so I bought another set. I was very very careful after the first incident, but the M6 snapped again on the 15th tap. This is not at all suited for use with aluminum. I returned both sets and will not buy from this manufacturer again.

ran two practice runs in the aluminum, went to do final drill in the piece of aluminum for the project and it immediately snapped and lodged itself in the aluminum,