http://tinyurl.com/oryce8w
CMT 537.127.31 Forstner Bit, 1/2-Inch Diameter, 3/8-Inch Shank
3-35/64-Inch Overall Length, Right-Hand Rotation.
2 spurs, 2 precision ground cutting edges, long-lasting cutting performance
Drill precise flat bottom holes with no chipping in any thickness of soft wood
For drilling holes in any direction and making arched openings
For drilling partially overlapped flat bottom holes or niches used to fix supports