Titanium nitride-coated step drills cut perfectly round 1/8" to 7/8" holes. Friction-reducing surface runs cooler and self-lubricates while running dry. Includes one each of #1, #2 and #3 step drills.
6 steps from 3/16" to 1/2": (3/16",1/4", 5/16", 3/8", 7/16", 1/2") .
9 steps from 3/16" to 7/8": (1/4", 5/16", 3/8", 7/16",1/2", 9/16", 5/8",11/16", 3/4").
13 steps from 1/8" to 1/2": (1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 318", 13/32", 7/16", 15/32", 1/2").