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Rather than have a set of counter sink bits that may not be the exact size you need, you could replace them with one adjustable countersink boring bit. Amana’s Di-Count fits over drill bits sized 3/32″ to 9/32″ to drill counter sunk holes for wood screws sized #2 to #18.

The 2-wing carbide-tipped bit will countersink screws up to 7/16″ deep.┬áThe countersink bit measures 1-1/4″ long and uses two screws to clamp around the pilot bit.┬áBefore shipping charges take a bite out of your wallet, you’ll pay about $23 for the Di-Count adjustable countersink boring bit.

Di-Count [Amana Tool]
Di-Count [ToolsToday]
Via Amazon [What’s This?]

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6 Responses to Adjustable Counter Sink Boring Bit

  1. Shopmonger says:

    I use these everyday in my shop……I use the cheapo ones form Harbour Freight….. they work great, and if they break or get hot once or twice, i simply throw them away…

    ShopMonger

  2. aaron says:

    i didnt know these existed at all, let alone a HF version. sweet.

  3. Dennis says:

    That looks a lot better than keeping a whole set of counter sink bits.

  4. Old Coot says:

    Help me understand how it centers drills of various sizes with only two screws.

  5. Shopmonger says:

    It makes the same size conterbore for the diff drill sizes……again go with a set for $5-$8

    ShopMonger

  6. Art says:

    I am looking for a clamp on 2 1/8″ flat bottom countersink bit to fit over a 5/8″ ships auger bit.
    I have an old one I found on my job and it has seen better days. No manufacturer name but it is made in the USA
    Any tips on where I could look would be greatly appreciated

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