There are a couple different types of tapered drill bits. Some have one flute, others two. The single flute ones are usually inexpensive imports and not very strong, prone to breaking. With tapered bits, you have to back out and clear the waste frequently, particularly on long bits. Several companies make the all in one tapered bit, countersink, counter bore bits, often with a stop collar. Some make carbide tipped countersinks, like Amana. I use Insty bits with the hex shank and quick release chuck. Haven't broken one of their bits and I've used them hard for years. I don't use them as counter bores very often and don't like stop collars. The countersinks can be used on normal drill bits. Some have replaceable tapered bits, others have non replaceable hex shank bits which usually give more reach.