Lenox 30886-VB6 Vari-Bit 3/8-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 3/8", 1/2" holes