3 piece step drill set. this is a 3 piece set that includes 1 of each of the following bits:
#1 step drill 1/8"-1/2" in 1/32" increments.
#2 step drill 3/16"-1/2" in 1/16 increments.
#3 step drill 1/4"-3/4" in 1/16" increments comes complete with a nice fitted wood case