3pcs HSS Step Drill Bit Set 4 12 20 32mm Cone Hole Cutter for Professional Use
3pcs Set 4-12/20/32mm Large HSS Steel Step Cone Drill Bit Hole Cutter. Material: HSS steel. 3pcs Set Step Drill Bits. No need to use center punch, not easy to break. Can work with pistol drill, bench drill etc.