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When I started woodworking about 40 years ago, I bought a set of fully adjustable drill bits. I think they were called "Scroo-Drills," and I think they came from Brookstone. These bits are great! With just a set screw, I can adjust the length of the pilot hole, the clearance hole, and even the countersink (i.e., level w/ the wood surface or inset below the surface).

The set consists of #6, #8, #10, and #12. I don't remember the cost, but whatever it was, it was worth it. Now, after 40 years, these guys are getting dull and losing their temper (just like me, but that's another story…). I can't find any replacement bits as versatile as these. Can anybody give me a lead?
 

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Discussion Starter · #3 ·
Joe-

I've got a set of those, and I must confess that I've never used them. I've heard that the tapered pilot hole is superior to an ordinary pilot hole. But the ones I'm referring to are more elaborate, w/ separate sections for the pilot (non-tapered) and clearance holes. If I had enough tech savvy, I'd take a picture and post it.

But maybe the availability of yours answers my question: maybe they're an improvement over my old ones, and that's why the old ones aren't sold anymore.
 

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Jim, I know exactly what you're talking about, have a set that are easily 40 plus years old too. If I recall they're referred to as adjustable countersink +counterbore bits. The set I have were made by Stanley; no idea if they're still available. As you said, they are/were great bits.

Mark.
 

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The tapers bits were for old style wood screws. The newer wood screws are straight and many have drill tips on them. Unless I'm restoring antiques I toss the old style screws in the trash.
These are what's used in commercial shops…
http://www.snappytools.com
http://www.deerwood.com/catalog/index.php?cPath=10http://www.deerwood.com/catalog/index.php?cPath=1_6
I keep a set of Makita quad driver bits in the to go drill case…
http://www.makitatools.com/en-us/Modules/Accessories/AccessoryDetails.aspx?ID=34161
 

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I see at the snappy tool site some two piece drill and flat bottomed counter bores that I like but none with a 3/8" counter bore. I used to have some spade type bits with a flat bottomed counter bore in this smaller size but I do not know where to buy them now, if they are still made. Anyone know where I could get them?
 

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Woodcraft and Rockler have them. And like has been mentioned, unless you are using the old style WOOD screws, make sure you don't get the Tapered style. They make sets with straight center bits, for the new style screws. They aren't expensive.
 

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