These are 5 star hex wrenches. I'm a mechanical engineer, former state-certified car mechanic and RC hobbyist (among other hobbies). I have a few different tools and brands (snap-on, sk, team losi, craftman etc) but by far this particular brand and style (old vs new is "old") is great for RC building and other projects. The tips have always been strong and the knurled handle provides a good grip on the instrument. I bought these instead of the 'new' style, mainly because I know the 'old' styleβ¦