an interesting story regarding speeds and feeds. my brother installed a railing in a house he owned one time. just one of those cheapy, imported, lumber house specials. not thick steel by any standards, maybe .094-.100 at best. all the holes drilled ok until the last one. it was a real toughie ! my brother thought it was a combination of imported steel, who knows quality of the bit, and the fact there was many holes drilled with a used bit to start with. anyway, he just gives it all he got and finally, got it pushed through [hand drill of course]. the hole looked like he used a torch of some kind to blow it through, and the drill was "slightly" deformed on the tip. he had the drill wide open, and was pushing with all he had. one spin of the drill to cool it off some, and yep ! it was in REVERSE ! i still jack him about that from time to time !