I went through a lot of screw piloting drill bits before I settled on this combination. The tapered drill bit is sold by Lee Valley, and the countersink is a Dimar. It has carbide cutters and is made of two parts which clamp around the drill bit allowing it to be installed on any drill bit up to 1/4" diameter.
It is more expensive that some others, but lasts for years and years. And it works! Money well spent.
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