Irwin 5/8 - 1-3/4 in. Dia. x 5-1/2 in. L High Speed Steel Wood Boring Bit 7/16 in. 6-Flat Shank 1 pc.

A fantastic tool, with really nice attention to manufacturing quality. Tool adjustment is easy and accurate, and it holds where you put it. And the results are entirely satisfactory - clean, accurately sized holes. It take a bit of learning to manage the hole start with softer woods, but with a bit of practice and some patience, and a good drill press, this bit has put an end to my use of those cheaper non-adjustable hole saws. It is a bit challenging to use it without a drill press, so if you're looking to drill holes in wood that you can't put on your press, this might not be the answer for you. On the other hand, if you go slow enough t start, its possible.