Lenox 30882-VB2 Vari-Bit 1/2-Inch to 1-Inch Step Drill Bit with 3/8-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 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16" and 1" holes