Countersink / counterbore and clearance hole all in one go?

[wide74]

Colt do a zero mark in three sizes. Fully adjustable for pilot and countersink depths as well. Good stuff nicely made. CW Tyzak sell them on eBay if I remember correctly.

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[matt]

Thanks once more for all the input. With regard to the screws with the shank narrower than the thread... It's a good point but I'm quite often hammering the nail through the clearance hole to mark the wall before drilling plugs. Nevertheless, the Trend bit I linked to in an earlier post arrived today and is exactly what I was after.