http://www.eagleamerica.com/product/v310-0420
These forstner bits feature a totally new cutting head design that can drill 3.6 times as many holes as a standard forstner bit. These bits combine the durability of forged steel with CNC ground precision. The hex shank provides no slipping in the chuck and precise results when machining the hardest of materials. The "wavy" cutting rim produces less heat for considerably longer tool life while providing a quick and smooth cutting action. Made in Austria.