Review on High Speed Woodworking Center Countersink - 3mm to 10mm by Stetson Olsen

These bits center and countersink wood reasonably well without damaging the finish. The adjustability is a great feature. So far I've only used them in softwood (pine) so I'm not sure of their longevity or durability or use in other materials, but so far so good. I am happy with this purchase so far.