Lenox 30881-VB1 Vari-Bit 1/8-Inch to 1/2-Inch Step Drill Bit with 1/4-Inch Shank Drill bits feature a 2-flute design that cuts fast, clean, round holes Enhanced flute design allows drill bits to remove chips rapidly Each drill bit has a steam-oxide treatment that adds durability Split-point design starts on contact for fast penetration and less walking Drills 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 15/32" and 1/2" holes Accurate, burr-free holes Starts drilling on contact Shank Size (inches): 1/4" Steam oxide coating adds durability Two flute design cuts fast, clean round holes