VARI-BIT STEP DRILLING #1-1/8" 1/2" 13 SIZESDrill 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