http://tinyurl.com/m6xtnx6
Lenox 30883-VB3 Vari-Bit 1/4-Inch to 3/4-Inch Step Drill Bit with 3/8-Inch Shank
Accurate, burr-free holes
Starts drilling on contact
Shank Size (inches): 3/8"
Steam oxide coating adds durability
Two flute design cuts fast, clean round holes