Review on Amana 55203 CT COUNTERSINK SCREW: Precision Fastening Solution for a Range of Applications by Robert Aiono

I read about this last summer while making some Ipe decks. After firing several other sinkers on the same deck. I paid extra for some. One of them has drilled several thousand holes this summer and can still drill finished holes for cabinets this winter. It's worth $25 a bit. PS I had to replace the drill bit after each deck as they tended to burn out during long drilling sessions.