I'm not a locksmith but a hobbyist working on small CNC machines and bikes that are usually metric so I settled on this set. It's also my first set, so I don't really have a comparison. I have a lot of drill bits (like most people) so I can say there is a big difference between them and the standard set of black oxides. It's also very handy to have them with taps, especially metric ones. The body is nice sheet metal too (although I wish they had the little ones in the front so 4.99⭐ lol). Drills and taps cut like a dream for the 10 or so times I've used this so far. I always use some oil but I don't think it's needed for aluminum. Will update this if I run into any problems.