Lenox 30909-VB9 Vari-Bit 7/8-Inch, 1-1/8-Inch and 1-7/32-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