I bought a package of 25 mixed drill bits at a swap meet this guy was showing how they can drill thru leaf springs and they do it very well the problem is I like them so much I want more and don't know were to find them? There different looking than any drill bits I've seen.There twice a normal drill bits length some start with a small bit then go to a bigger one.At the end were you put it in the chuck it is larger and it has 4 little dimples I'm assuming they were a quick disconnect?? does anyone have any ideas were to get them? Thanks KustomDon