This step drill bit from Irwin is useful for creating holes in thin metal and laminate work pieces. It progressively widens at regular intervals, so users can drill multiple hole sizes. The Irwin drill bit features high-speed-suited metal that tolerates demanding workloads well. A self-starting point penetrates the surface with no need to make a pilot hole beforehand. A SpeedPoint tip provides fast penetration without skipping. With a continuous fluted cutting edge, this step drill bit makes progressive holes with full control. The #5 Irwin drill bit features 10 different size increments ranging from 1/4" to 1-3/8".