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ASNOMY 7Inch Extra Long Forstner Bit Extension for Adding Over 5-3/4 inches of Drilling Depth to Your 3/8' Round or Hex Shafts Forstner Bit

4.6 (13) Write Review
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$13.99

$ 6 .99 $6.99

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About this item

  • 👷Extends any Forstner bit shank an additional 5-3/4 inches, Helps you use standard forstner drill bits drilling for flat bottom holes or start deep hole turning projects like on larger vases or containers;
  • 👷The collet inside diameter is 3/8 inch(9.7mm). This tolerance is very tight and designed to accept forstner bits with shank sizes of 3/8 inch or slightly smaller;
  • 👷High-carbon steel construction, precision ground and polished, ensuring it's sturdy and durable;
  • 👷Two set screws and hex key included. To fasten the shank in place, use the hex key to tighten these screws;
  • 👷Hex Shank Dia.: 3/8-inch, Total length: 7 inch, Extend Length: 5-3/4 inch.


Product Description

Extension
Extension
Extension
Extension

Andreas Alschinger
Reviewed in Germany on February 3, 2025
Gerne wieder
WES
Reviewed in the United States on February 28, 2025
Good quality. Holds drill bit tightly and straight.
Robert J.
Reviewed in the United States on February 28, 2025
The collet diameter is 3/8. If your bit shaft is smaller, then placing it in the collet and tightening the set screws will result in the bit being off center. There needs to be a bushing that fits the collet for smaller size shafts or there needs to be set screws on both side, where when tightened equally can center the bit shaft in the extension. But as currently designed, my Forstner bit is not centered and wobbles. To overcome this, I drill as deep as I can without the extension, then add the extension and drill the remaining distance. Luckily for me I only need to drill another 1/2 inch deeper, so the wobble is not much of a factor, but contributes to a sloppy bottom of the hole.
thi.phil
Reviewed in Belgium on February 28, 2025
très bien et a rÊpondu a mes attentes
frank4sure
Reviewed in the United States on February 19, 2025
I bought this as an extension to a 3/8” forstener bit. This has 3/8” drive but the forstener bit sits in a round receiver w 2 hex tighteners. That is OK but the round receiver doesn’t accept the bit as it is undersized. I had to use a drill press to enlarge the hole as a 3/8 hex is actually nearly 4/10” at the points. I bought a second longer one that has hex for the bit and the drive as it is stronger. Still need hex to keep in place but in a round receiver they take the entire beating. Would recommend higher quality for long term use.
Kelsey Anderson
Reviewed in the United States on February 12, 2025
Heavy, well-made tool. I use it to bore into hardwoods and it performs perfectly.
David McCormick
Reviewed in the United States on January 7, 2025
Worked great. Used it with new full-size lathe. Just make sure it is snug with the different Forester bits shank diameters.
harel
Reviewed in France on January 5, 2025
parfait
Avid reader
Reviewed in the United States on January 25, 2025
Just what I wanted
Melo
Reviewed in Italy on September 10, 2024
Ottimo prodotto
Gill Vardy
Reviewed in Sweden on June 30, 2024
Jag är mycket nöjd! Har borrat med 25 mm bort och det gick bra! Enligt instruktionen man ska ha Max 13 mm…
resneps
Reviewed in the United States on December 29, 2024
Does not properly fit a 3/8" Forstner bit. Severe wobbling when attempted to use.
Leonard Watson
Reviewed in the United States on October 7, 2024
Seems to be an ok extension but does seem to have a little bit of runout. So far it has done what I needed it to do.