Amana Tool 55225 Carbide Tipped Countersink with No Burning and Marring Adjustable Depth Stop No-Thrust BB, 3/8 D x 3/32 Drill 1/4 Inch Quick Release Hex SHK

great tool use it alot

A well manufactured, easy to use tool that delivers great results, though expensive

Takes all the guesswork out of accurately countersinking for carpentry work.

I wish it were a bit smaller but it works like a charm. By far the best ive used.

Seemed to work fine while it lasted, but the nut controlling the depth stop quickly stripped the threads after few hours of use and 3-4 depth stop adjustments. Sending it back. Edit: I got a replacement, and also tried a festool 3.5mm bit and decided to bump this up to 4 starts because while flawed this is still the best counter sink bit you can get. Compared to festool this chews through the wood and easily allows for deep counter sunk bores. No trouble evacuating the chips, and carbide tip really makes a difference. I wish that they would fix the nut problem. It seems that the nut that comes with the bit is too small, so only the first few threads take all the force. A longer nut would have probably helped with the stripping issue.