3-Piece Taper Drill Countersink Set includes taper bits and 4-flute countersinks for #6, #8 and #10 screws. Wrench for adjusting countersink included.
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Have used these for years and very happy with them. Just needed a replacement bit and some more as a gift. Only slight negative is that the countersink tends to load up with some woods and needs to be cleared. Luckily I found your site on Amazon which did not carry everything I needed. Delivery was quick as promised.
When I got these in I tried them on some really hard white oak. I screwed two 3"x6" pieces together at a 90 deg and it made a really good joint, very tough. Screws were easy to flush out and hold extremely tight.