Review on Efficiently Tackle Hard Metal Projects With Aiyun'S 6-Pack Metric Drill Tap Set For Steel And Aluminum by Samuel Groove

I'm an industrial maintenance tech, and these are supposed to be the stronger drill/tap bits but the first time I used this one in being aluminum this is what happened. It broke right in half. This is the second set of these I've had the first set was for thinner metals well they broke right off of course. This is the second set it's supposed to be heavier duty for thicker steel. Yeah right won't even stand up to less than 1/8 of an inch thick aluminum. JUNK!