Irwin 10220 Unibit #20 9/16" to 1" Step Drill Bit
High Speed Steel Fractional Hole Enlarging Features:
Single-flute cutting edge for better control through steps
Diablo DHS4BITCB 4" Cobalt Pilot Drill Bit Diablos high performance Pilot Bit delivers faster cutting performance and increased productivity and is designed to fit all snap-lock plus mandrels...
Milwaukee 48-89-9203 #3 Step Drill Bit, 1/4" - 3/4" by 1/16"
Milwaukee® Step Drill Bits with JAM-FREE Performance feature a dual-flute design delivering up to 2X faster hole times, up to 4X longer...