I know this is probably the wrong place for this post, but all you here seem to be machinists of one sort or another so I need info and advice. I have bought my last set of cheap sh@# drill bits. The last set I got was so bad that Harbor Freight turned them down. I have literally unscrewed half of the bits when the cutting edge catches and the flukes untwist. So I am gonna buy good bits. So what is the best. I can find High speed steel, cobalt, split tip, multi tip, carbide tip, I expect to be drilling steel, including some harder stuff like circular saw blades etc. Will also be drilling aluminum , plastic, brass, wood, etc. Also, what is the difference between sets that are fractional, and those sets with numbered drills.