Fulton 10 inch Long Forstner Bit Extension for Adding Over 8" of Drilling Depth to Your Forstner Bit Ideal for Wood Turners Furniture Carpentry and Construction (3/8 inch Collet)

It's durably built. You can tell it's well constructed when you first pick it up. The screws does hold the bit in place very securely. I found that to be the case even when only one of the two screws is used. But I due recommend using both when possible. As stated on Amazon. All 3/8 inch bits are not the same. I had three - one didn't fit at all, another only fit deep enough to reach one of the screw holes (which was sufficient), a third one fit completely where both screws could be used to secure the bit. My suggestion would be to get the smallest 3/8 inch shank you can find or get the one that's from the manufacturer of the extension. The one that fits perfectly I found at Ace Hardware, so that's another option. The others I had came from Harbor Freight Tools and Home Depot. Not a kock on these great outlets, just saying their 3/8 shank don't appear to perfectly fit the extension from this manufacturer.

At first I was hesitant about whether or not it would work as described. Rest assured this tool is a quality piece that works as described.I use it to extend my Irwin wood auger bits. My bits have the faceted drive ends and they fit almost snugly into the Fulton bit extender. When the allen screws are tightened the unit runs with no apparent runout. I didn't try using a dial indicator on it but, I couldn't see or feel any wobble while drilling through 2 inch oak floor joists. YMMV

As other reviews describe perfectly, the extension is nice if it would actually fit 3/8" shank fostner bits. Unfortunately they undersized the opening for bits and is not compatible with most 3/8" shanks

It seems to be well build and does what it says it will do. Worked perfectly in my application where I had to drill deeper than the shank of the bit would allow.

If, for whatever reason, you need an extension for your forsner biti(s), this is a good choice. Solid tool steel; bit clamps in place with two set screws. Allen wrench included. Comes in various lengths.

The question in my mind was, "will this fit the shank of the forester bits I have without being off-center?" The answer is yes.So, if you have 3/8" shank bits this works fine. If you have other bits, it will not be centered.

Was a little disapointed in this bit extender that even though it says that it fits a standard size shank and Amazon had this listed as frequently purchased with the bit I purchased the bit did not fit this extender without modification being required on the bit shank. On top of the sizing the set screws seem to have both stripped out when tightening down on the first bit used. I would not recommend.

This Forstner Bit Extension is very impressive. Well built, turns true and good quality set screws. 3/8" Forstner shafts and the Forstner Bit Extension with a 3/8" hole is a perfect match. No wiggle room when bit is inserted and tightened. I have different lengths of this brand of Forstner Bit Extensions and all are of the same quality. Highly recommend.