Have only used twice, but effective for what I was doing. When using a power drill/driver, use slow speed setting. Practice on scrap first to get the hang of it.
Listen, I'm not a big fan of gimmicky, "this will solve all your problems" products... Having said that, oh my ***** dayum, these work so good. First time, out of the box, saved me so much time that if I see another larger set, I will buy it immediately.
I used the M4 and M5 taps several times now on mild steel and they work great - you really can't fault them for the price. Just go slow and use cutting oil and they will last a long time.
Perfect addition to my toolbox
These little fellas held up strong against a stainless steel railing.
Super for sheet metal or aluminum up to 3?16" thick for drilling and tapping in one step.